Grade 8 - Angles

Front

What is an angle?

Back

An angle is formed by two rays (sides of the angle) that share a common endpoint (the vertex).

Front

What is the measure of a right angle?

Back

A right angle measures exactly 90 degrees.

Front

What are acute angles?

Back

Acute angles are angles that measure less than 90 degrees.

Front

What are obtuse angles?

Back

Obtuse angles are angles that measure more than 90 degrees but less than 180 degrees.

Front

What is a straight angle?

Back

A straight angle measures exactly 180 degrees.

Front

Define corresponding angles.

Back

Corresponding angles are angles that are in the same position on two parallel lines cut by a transversal.

Front

What is a transversal line?

Back

A transversal is a line that intersects two or more lines at different points.

Front

What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always equal.

Front

How do you find the measure of an unknown angle when given a right angle?

Back

Subtract the known angle from 90 degrees to find the unknown angle.

Front

What is the sum of angles in a triangle?

Back

The sum of the interior angles in a triangle is always 180 degrees.