Eureka Math Grade 4 Module 4 Topic A Flashcard

Front

What is an acute angle?

Back

An acute angle is an angle that is smaller than 90 degrees.

Front

What tool do we use to measure angles?

Back

We use a protractor to measure angles.

Front

What is a ray?

Back

A ray is a part of a line that starts at a point and extends infinitely in one direction.

Front

What are parallel lines?

Back

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

Front

What is a right angle?

Back

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

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that is larger than 90 degrees but smaller than 180 degrees.

Front

What is the difference between a line and a line segment?

Back

A line extends infinitely in both directions, while a line segment has two endpoints.

Front

What does it mean for lines to be perpendicular?

Back

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

Front

How do you identify an acute angle in a diagram?

Back

An acute angle is usually smaller than the corner of a square or rectangle.

Front

What is the symbol for an angle?

Back

The symbol for an angle is usually represented by the letter '∠' followed by the points that form the angle.