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These grade 4 classifying angles worksheets are made for Grade 4 learners, with four difficulty levels so you can match the practice to the child.

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Grade 4 Classifying angles Worksheets

Grade 4 practice: Classify drawn angles as acute, right, obtuse or reflex. Choose a level below to generate a fresh set of questions.

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Understanding classifying angles

Classifying angles asks learners in Grades 3 to 5 to name a drawn angle as acute, right, obtuse or reflex by how far it opens. A right angle is exactly 90°, an acute angle is less than 90°, an obtuse angle is between 90° and 180°, and a reflex angle is greater than 180°. Judging angle size by eye, using the right angle as a benchmark, builds the sense needed before measuring with a protractor.

For example, the corner of a book is a right angle (90°); an angle that opens just a little, like 30°, is acute, while one that opens wide, like 130°, is obtuse. A common mistake is calling any “big-looking” angle obtuse without comparing it to a square corner. Tip: picture a right-angle corner on top of the angle — smaller means acute, a bit wider means obtuse, much wider (past a straight line) means reflex.

Sample classifying angles questions

These examples come from the Easy setting. Generate a worksheet for a complete page with space for working.

Classify the angle shown.
Classify the angle shown.
Classify the angle shown.
Classify the angle shown.

Check the sample answers

right
acute
obtuse
obtuse

Practice focus

Classify drawn angles as acute, right, obtuse or reflex. Label diagrams carefully and explain the property you used.

Grade 4 Classifying angles Worksheets

Understanding classifying angles

Sample classifying angles questions

Practice focus

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