Acute, Right, Obtuse

Smaller than a right angle: acute. Bigger: obtuse

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About This Practice

The angle family has three members: acute angles are smaller than a right angle, right angles measure exactly 90 degrees, and obtuse angles are bigger. An angle appears on screen — compare it with a right angle in your head, then tap “acute / right / obtuse” to sort it. Correct answers draw a dashed right angle beside it, so every judgment is backed by evidence.

An angle appears on screen — compare it with a right angle in your head, then tap “acute / right / obtuse” to sort it. Correct answers draw a dashed right angle beside it for comparison.

EasyEstimated Time: 8minacute angleright angleobtuse anglesorting

How to Play

  1. Look at the angle on screen and picture a right angle overlapping it.
  2. Compare the openings: smaller, equal, or wider than the right angle?
  3. Tap “acute”, “right” or “obtuse” to make your call.
  4. After a correct answer, check your reasoning against the dashed right angle.
  5. Keep going until you can classify at a glance without the helper.

Learning Objectives

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