Lesson 6-7 Geometry

Front

What is the value of x if x + 20 = 138?

Back

x = 118

Front

How do you find the missing angle in a triangle if two angles are known?

Back

Subtract the sum of the known angles from 180 degrees.

Front

What is the measure of the missing angle if one angle is 80 degrees and the other is 60 degrees?

Back

The missing angle is 40 degrees.

Front

What are vertical angles?

Back

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

Front

Identify the term for a part of a line that has one endpoint and extends infinitely in one direction.

Back

Ray

Front

What is the sum of the interior angles of a triangle?

Back

180 degrees.

Front

If two angles are complementary, what is the relationship between them?

Back

Their measures add up to 90 degrees.

Front

What is the definition of an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is the definition of a right angle?

Back

An angle that measures exactly 90 degrees.

Front

What is the definition of an obtuse angle?

Back

An angle that measures more than 90 degrees but less than 180 degrees.