Front

If DF = 9x - 39, find EF. (Hint: Use Segment Addition to find x, then plug into EF)

Back

EF = 58

Front

Two angles that add to be 180 degrees are called _____________.

Back

Supplementary

Front

Points that lie in the same plane are called _____________.

Back

Coplanar points

Front

The symbol ⊥ is used for which of the following notations?

Back

Perpendicular lines

Front

What does the word BISECT mean?

Back

To cut something into two congruent pieces or in half.

Front

What is the definition of complementary angles?

Back

Two angles that add up to 90 degrees.

Front

What is the definition of collinear points?

Back

Points that lie on the same straight line.

Front

What is the formula for the area of a triangle?

Back

Area = 1/2 * base * height.

Front

What is the definition of a line segment?

Back

A part of a line that has two endpoints.

Front

What does it mean for two lines to be parallel?

Back

They never intersect and are always the same distance apart.