Grade 4 Angles & Lines Quiz

A free Grade 4 Angles & Lines quiz. Play without signing up; sign in to save your score.

Grade 4 gradeMath subjectFree quiz

Fourth-grade angles and lines names right, acute, and obtuse angles and uses a protractor in 180-degree measure. A right angle is 90 degrees. Acute is less than 90. Obtuse is greater than 90 and less than 180. Parallel lines never meet; perpendicular lines meet at a right angle.

The Grade 4 Angles & Lines quiz is free to play without signing up. Sign in to save scores. Classic has a timer; Trivi gives three hearts; Learn is untimed with no score.

What you practice

These are the Grade 4 Angles & Lines skills this quiz is built around.

Classify an angle as acute, right, or obtuse by comparing it with 90 degrees.
Read a protractor to the nearest 5 or 10 degrees on a labeled diagram in words.
Identify parallel and perpendicular lines in a plane figure.

A useful tip

Compare every angle with a square corner. Smaller than that corner is acute. Larger, but still an opening less than a straight line, is obtuse. A straight line is 180 degrees, not an obtuse angle.

Frequently asked questions

What does Grade 4 Angles & Lines practice?

Practice includes: Classify an angle as acute, right, or obtuse by comparing it with 90 degrees; Read a protractor to the nearest 5 or 10 degrees on a labeled diagram in words; Identify parallel and perpendicular lines in a plane figure.

Is the Grade 4 Angles & Lines quiz free?

Yes. This quiz is free to play without signing up. Sign in to save your scores and progress.

What game modes can I use?

Classic has a timer; Trivi gives three hearts; Learn is untimed with no score.