A | | B | | C | | D | | E | | F | | G | | H | | I | | K | | L | | N | | O | | P | | Q | | R | | S | | T | | U | | V

A

A

: an angle less than 90 degrees

: the space between two intersecting lines that share the same endpoint

: the point off the base of a pyramid where the triangular sides meet

: the number of square units needed to completely cover a 2-d shape

B

B

: the bottom face of a solid

C

C

a perfectly round 2-d figure. All points on a circleâ€™s outline (the circumference) are the same distance from the centre.

: the perimeter of a circle

: turning in the same direction as the hands of a clock around a clock face

: a tool for drawing circles

: two angles that measure 90 degrees in total

a 3-d solid with one circular base, and one vertex (apex), and a curved surface all around

: geometric shapes that have the same size and shape

: opposite of clockwise

: a special rectangular prism made of 6 equal squares

: bent not straight as in the outline of circles or some surfaces found in cylinders, cones, etc.

: a solid shaped like a tube with two circular bases and a curved surface all around.

D

D

: a ten-sided polygon

: a unit for measuring the size of an angle (one full turn is 360 degree)

: a straight line segment whose endpoints are on the circle and its middle is the centre of the circle

dodecagon: a twelve-sided polygon

E

E

: the line on a 3-d solid where two faces meet

: refers to a polygon whose sides are equal in length (example: equilateral triangle)

F

F

: a flat surface of a polyhedron surrounded by edges

G

G

geoboard: a board with a number of pegs. Elastic bands are wrapped around the pegs to make polygons in order to study their properties (perimeter, area, angles, etc.)

: a branch of mathematics that studies points, lines, angles, shapes, solids, etc.

H

H

: a seven-sided polygon

: a six-sided polygon

: a prism with 8 faces (2 hexagonal and 6 rectangular), 18 edges, and 12 vertices.

: a pyramid with a hexagonal base and six triangular faces that meet at the apex.

I

I

: angles on the inside of a shape

cross

intersecting lines: two different lines that cross one another and share only one point (at their intersection)

: a paper with dots that are equally spaced apart

: a triangle with two equal sides

K

K

: a quadrilateral with 2 pairs of equal sides. Each pair is adjacent (side by side and sharing a point)

L

L

line of reflection: a line used to reflect or flip a shape

line of symmetry: a central dividing line that creates two congruent halves, which are reflection of each other

N

N

: an outline that can be folded up to build a 3-d model of a solid

: an nine-sided shape

O

O

: an angle that measures between 90 and 180 degrees

: an eight-sided shape

: a solid with 10 faces (2 octagonal and 8 rectangular), 24 edges, and 16 vertices.

: a pyramid with 1 octagonal base and 8 triangular faces that meet at the apex.

: a round shape that looks like a circle that has been stretched

P

P

: lines that run side by side and never intersect nor get closer or farther

: a quadrilateral whose opposite sides are parallel

: a five-sided shape

: a solid with 7 faces (2 pentagonal and 5 rectangular), 15 edges, and 10 vertices.

: a pyramid with a pentagonal base and five triangular faces that meet at the apex.

: the distance around a closed shape

: at right angles, forming a 90 degrees angle

: a closed shape that is made of at least 3 side

: a 3-d solid with polygons as its faces

: a solid with two congruent, parallel bases and rectangular sides

: a tool for measuring angles

: a solid that has one base and a set of triangles as its sides, which slope to meet at a single point (apex) above the base

Q

Q

: any four-sided polygon

R

R

: the distance between the center of a circle and any point on the circle

: a quadrilateral which has 4 right angles

: a solid with 6 rectangular faces, 12 edges, and 8 vertices.

: a pyramid with a rectangular base and four triangular faces that meet at the apex.

: flip

: an angle greater than 180 degrees, but less than 360

: a vertex of a polygon that forms an interior angle greater than 180 degrees

: a polygon whose sides and angles are all equal (e.g., square)

: a parallelogram with four equal sides

: a 90 degrees angle

: a triangle that has a right angle

: a trapezoid with two right angles

: turn

S

S

: a triangle with no equal sides

: half of a circle

: a 3-d solid that looks like a ball

: a special quadrilateral with 4 equal sides and 4 right angles

: a pyramid with a square base and four triangular faces that meet at the apex.

: an angle that measures180 degrees

: two angles that measure 180 degrees in total

: a shape having two halves which are mirror images of each other

T

T

: a repeating pattern of shapes that cover a surface without overlapping the shapes or leaving any gaps

: slide

: a quadrilateral that has only one pair of parallel sides

: a three-sided polygon

: a solid with 5 faces (2 triangular and 3 rectangular), 9 edges, and 6 vertices.

: a pyramid with 4 triangular faces, 6 edges and 4 vertices.

U

U

(also calledhendecagon): an eleven-sided shape

V

V

: the point where two sides of a polygon meet, or the point where three or more edges of a polyhedron meet

Geometry Glossary

A | | B | | C | | D | | E | | F | | G | | H | | I | | K | | L | | N | | O | | P | | Q | | R | | S | | T | | U | | V

## A

A: an angle less than 90 degrees: the space between two intersecting lines that share the same endpoint: the point off the base of a pyramid where the triangular sides meet: the number of square units needed to completely cover a 2-d shape## B

B: the bottom face of a solid## C

Ca perfectly round 2-d figure. All points on a circleâ€™s outline (the circumference) are the same distance from the centre.: the perimeter of a circle: turning in the same direction as the hands of a clock around a clock face: a tool for drawing circles: two angles that measure 90 degrees in totala 3-d solid with one circular base, and one vertex (apex), and a curved surface all around: geometric shapes that have the same size and shape: opposite of clockwise: a special rectangular prism made of 6 equal squares: bent not straight as in the outline of circles or some surfaces found in cylinders, cones, etc.: a solid shaped like a tube with two circular bases and a curved surface all around.## D

D: a ten-sided polygon: a unit for measuring the size of an angle (one full turn is 360 degree): a straight line segment whose endpoints are on the circle and its middle is the centre of the circledodecagon: a twelve-sided polygon## E

E: the line on a 3-d solid where two faces meet: refers to a polygon whose sides are equal in length (example:equilateral triangle)## F

F: a flat surface of a polyhedron surrounded by edges## G

Ggeoboard: a board with a number of pegs. Elastic bands are wrapped around the pegs to make polygons in order to study their properties (perimeter, area, angles, etc.): a branch of mathematics that studies points, lines, angles, shapes, solids, etc.## H

H: a seven-sided polygon: a six-sided polygon: a prism with 8 faces (2 hexagonal and 6 rectangular), 18 edges, and 12 vertices.: a pyramid with a hexagonal base and six triangular faces that meet at the apex.## I

I: angles on the inside of a shapecrossintersecting lines: two different lines that cross one another and share only one point (at their intersection): a paper with dots that are equally spaced apart: a triangle with two equal sides## K

K## L

Lline of reflection: a line used to reflect or flip a shapeline of symmetry: a central dividing line that creates two congruent halves, which are reflection of each other## N

N: an outline that can be folded up to build a 3-d model of a solid: an nine-sided shape## O

O: an angle that measures between 90 and 180 degrees: an eight-sided shape: a pyramid with 1 octagonal base and 8 triangular faces that meet at the apex.: a round shape that looks like a circle that has been stretched## P

P: lines that run side by side and never intersect nor get closer or farther: a quadrilateral whose opposite sides are parallel: a five-sided shape: a pyramid with a pentagonal base and five triangular faces that meet at the apex.: the distance around a closed shape: at right angles, forming a 90 degrees angle: a closed shape that is made of at least 3 side: a 3-d solid with polygons as its faces: a solid with two congruent, parallel bases and rectangular sides: a tool for measuring angles: a solid that has one base and a set of triangles as its sides, which slope to meet at a single point (apex) above the base## Q

Q: any four-sided polygon## R

R: the distance between the center of a circle and any point on the circle: a quadrilateral which has 4 right angles: a pyramid with a rectangular base and four triangular faces that meet at the apex.: flip: an angle greater than 180 degrees, but less than 360: a vertex of a polygon that forms an interior angle greater than 180 degrees: a polygon whose sides and angles are all equal (e.g., square): a parallelogram with four equal sides: a 90 degreesangle: a triangle that has a right angle: a trapezoid with two right angles: turn## S

S: a triangle with no equal sides: half of a circle: a 3-d solid that looks like a ball: a special quadrilateral with 4 equal sides and 4 right angles: a pyramid with a square base and four triangular faces that meet at the apex.: an angle that measures180 degrees: two angles that measure 180 degrees in total: a shape having two halves which are mirror images of each other## T

T: a repeating pattern of shapes that cover a surface without overlapping the shapes or leaving any gaps: slide: a quadrilateral that has only one pair of parallel sides: a three-sided polygon:a pyramid with 4 triangular faces, 6 edges and 4 vertices.## U

Ualso calledhendecagon): an eleven-sided shape## V

V: the point where two sides of a polygon meet, or the point where three or more edges of a polyhedron meet: more than one vertex