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Square

P=s+s+s+s

Rectangle

A Quadrilateral with 4 sides and 4 right angles.

triangle

P=a+b+c

Circle

in a plane, the set of all points equidistant from a given point

Line

A straight path that goes without end in two directions.

ray

Part of a line that has one end point and goes in one direction without end.

line segment

Part of a line with two end points.

Angle

Two rays with the same end point.

right angle

An angle that is 90 degrees (It makes a square in the corner).

Side

Line segments of a polygon.

vertex

The point where two sides meet. (Shared end points of the line segments of a polygon.)

Quadrilateral

A polygon with 4 sides and 4 angles.

Parallelogram

p=s+s+b+b

Trapezoid

P=s1+s2+b1+b2

Rhombus

a parallelogram with four equal sides and equal opposite angles.

Congruent

A plane figure with the same size and shape.

Symmetry

A plane figure that can be folded along a line so the two parts match.

line of symmetry

The line that divides two matching parts. It can be vertical, horizontal, or diagonal.

perimeter

The distance around a geometric figure.

area

the surface; Length x Width

rectangular prism

A solid shape that has: 6 faces (4 rectangles & 2 squares), 8 vertices (corners), and 12 equal edges.

cube

A solid shape that has: 6 square faces all equal in size, 8 vertices (corners), and 12 equal edges.

sphere

A solid shape that is perfectly round like a ball. No faces, edges, or vertices.

cone

A solid shape with a circular base and a curved surface that come to a point (vertex).

cylinder

A solid shape with one curved surface and two congruent circular bases.

pyramid

A solid shape with a polygon as a base and triangular faces that come to a point (vertex or apex)

volume

measures the amount of space taken up by the object.

face

The flat surface of a 3D shape.

Edge

Where two surfaces join (intersect).

plane

A flat surface.

polygon

a closed figure made by joining line segments where each line segment intersects exactly 2 others

Plane figure

A flat figure that can be closed or not closed.

congruent figures

The SAME SIZE and SAME SHAPE

Symmetrical

When one half is a mirror image of the other half.

length

measurement of the distance between two points

width

Distance across from side to side

Base

the number that is written with an exponent

Height

The shortest distance between the base of a geometric figure and its top.

Intersecting lines

Two or more lines that meet at a common point.

Acute Angle

An angle that measures LESS than 90 degrees.

Obtuse Angle

An angle that measures MORE than 90 degrees

straight angle

An angle that measures 180 degrees

angles

The amount of turning between two lines meeting a common point.

diameter

A straight line passing through the centre of a circle to touch both sides of the circumference.

Circumference

2πr

compass

Instrument used for making circles.

radius

From center to a point on the circle.

Vertical Angles

Angles opposite one another when two lines intersect.

Congruent Angles

Angles with equal measures are..

transversal

A line that intersects two or more lines.

acute triangle

A triangle with three acute angles.

obtuse triangle

A triangle with one obtuse angle.

Right Triangle

A triangle with one right angle.

equilateral triangle

Triangle with a 90° angle

isosceles triangle

Triangle with 2 equal sides and 2 equal angles.

Scalene Triangle

A triangle with no congruent sides

Rectangle

A quadrilateral which is a parallelogram with four right angles.

similar figures

Figures that have the same shape, but not necessarily the same size.