4th Grade Geometry Lines and Angles Flashcard

Front

What are perpendicular lines?

Back

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

Front

What is a right angle?

Back

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

Front

What are parallel lines?

Back

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

Front

How do you draw a line segment?

Back

Use a ruler or straight edge to draw a straight line between two points.

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 is an acute angle?

Back

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

Front

What is a straight angle?

Back

A straight angle is an angle that measures exactly 180 degrees.

Front

How do you measure an angle using a protractor?

Back

Align the protractor's center point with the angle's vertex and read the measurement where one line crosses the protractor.

Front

What is the sum of angles in a triangle?

Back

The sum of the angles in a triangle is always 180 degrees.

Front

What is a line?

Back

A line is a straight one-dimensional figure that extends infinitely in both directions.