Informal Geometry: Chapter Three Online Post-Test

Front

What is the angle formed by lines KL and ML in long form?

Back

∠KLM

Front

What is the angle formed by lines DE and EF in long form?

Back

∠FED

Front

If \( \overrightarrow{KM} \) bisects \( \angle LKJ \) and \( m\angle JKM=22\degree \), what is \( m\angle LKM \)?

Back

22°

Front

What do adjacent angles share?

Back

A vertex.

Front

How many acute angles must an acute triangle have?

Back

3

Front

Define an acute angle.

Back

An angle that measures less than 90 degrees.

Front

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

Back

180 degrees.

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.

Front

Define complementary angles.

Back

Two angles whose measures add up to 90 degrees.

Front

Define supplementary angles.

Back

Two angles whose measures add up to 180 degrees.