Basic Geometry Review

Front

Part of a line. Has one endpoint and continues on forever in one direction.

Back

Ray

Front

An angle whose measure is less than 90° is called an

Back

Acute Angle

Front

∠1 and ∠2 form a linear pair. If m∠1 = (5x + 9)° and m∠2 = (3x + 11)°, find the measure of each angle.

Back

m∠1 = 109° and m∠2 = 71°

Front

If m∠ABC = 103° find x.

Back

15

Front

Given m∠QST = 135°, find the value of x.

Back

x = 26

Front

A straight line that extends infinitely in both directions is called a

Back

Line

Front

An angle that measures exactly 90° is called a

Back

Right Angle

Front

Two angles that are opposite each other when two lines intersect are called

Back

Vertical Angles

Front

The sum of the angles in a triangle is always equal to

Back

180°

Front

An angle whose measure is greater than 90° but less than 180° is called a

Back

Obtuse Angle