4B M4 Lesson 4

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

What is an obtuse angle?

Back

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

Front

What does it mean for lines to be parallel?

Back

Parallel lines are lines that never meet and are always the same distance apart.

Front

What does it mean for lines to be perpendicular?

Back

Perpendicular lines are lines that intersect at a right angle (90 degrees).

Front

What does it mean for lines to intersect?

Back

Intersecting lines are lines that cross each other at one point.

Front

How can you identify an acute angle in a shape?

Back

Look for an angle that is smaller than a right angle (less than 90 degrees).

Front

How can you identify a right angle in a shape?

Back

Look for an angle that forms a square corner (90 degrees).

Front

How can you identify an obtuse angle in a shape?

Back

Look for an angle that is larger than a right angle (more than 90 degrees but less than 180 degrees).

Front

What is an example of parallel lines in real life?

Back

Railroad tracks are an example of parallel lines.