Geometry Basics

Front

What is a line segment?

Back

A line segment consists of two endpoints and all the points in between.

Front

What is the measurement of a right angle?

Back

90 degrees.

Front

What is the sum of the angles in a triangle?

Back

180 degrees.

Front

What is a ray?

Back

A ray is a part of a line that starts at one point and extends infinitely in one direction.

Front

What is the definition of an angle?

Back

An angle is formed by two rays that share a common endpoint.

Front

What is the difference between acute, obtuse, and right angles?

Back

Acute angles are less than 90 degrees, right angles are exactly 90 degrees, and obtuse angles are greater than 90 degrees but less than 180 degrees.

Front

What is a parallel line?

Back

Parallel lines are lines in a plane that never meet and are always the same distance apart.

Front

What is a perpendicular line?

Back

Perpendicular lines are lines that intersect at a right angle (90 degrees).

Front

What is the formula for the area of a rectangle?

Back

Area = length × width.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2πr, where r is the radius.