Math Vocab

shania khan

Adjacent angles

Two angles are Adjacent when they have a common side and a common vertex (corner point), and don't overlap.

Alternate exterior angles

Alternate exterior angles are congruent. Alternate exterior angles are defined as two exterior angles, which cut through a set of parallel lines.

Alternate interior angles

these are inside the two parallel lines, and are on opposite sides of the transversal.

And they are equal in measure.

Complementary angles

Complementary angles are two angles that sum up to 90°.

Corresponding angles

  1. the angles that occupy the same relative position at each intersection where a straight line crosses two others. If the two lines are parallel, the corresponding angles are equal.

Supplementary angles

Supplementary angles are angles that have angles that add up to 180°

vertical angles

Vertical angles are each of the pairs of opposite angles made by two intersecting lines.

Parallel lines

Parallel lines are a set of lines that run straight side by side and never ending.

Perpendicular Lines

at an angle of 90° to a given line, plane, or surface. Shows with a small square at the corner of the 90° angle.

Transversal line

a transversal is a line that passes through two lines in the same plane at two distinct points.


The outside line or boundary for a geometric figure.


In geometry the area of a shape is the size of the surface.

surface area

The total area of the surface of a three-dimensional object.


Volume is the measure of the amount of space inside of a solid figure, like a cube, ball, cylinder or pyramid in cubic meters.


Circumference = π × diameter = 2 × π × radius.


the diameter of a circle is any straight line segment that passes through the center of the circle.


The distance from the center to the edge of a circle. It is half of the circle's diameter.


a face is a flat surface that forms part of the boundary of a solid object


an edge is a particular type of line segment joining two vertices in a shape.


a vertex is a special kind of point that describes the corners or intersections of geometric shapes.