Classifying Triangles Worksheet
Classify each triangle twice — by its sides and by its angles. Equal sides are marked with tick marks, and right angles with a small square.
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- No AI — answers are calculated, not guessed
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Example worksheets
Made with this tool — click any example to see it full size.
Best for: Grades 4–6
By sides
Equilateral: all three sides equal. Isosceles: two sides equal. Scalene: no sides equal.
By angles
Acute: all angles less than 90°. Right: one 90° angle. Obtuse: one angle greater than 90°.
Make it a timed challenge
Put a visual classroom timer on the board and see how many problems students can finish before the time runs out. Print a new version tomorrow and try to beat the score.
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Frequently asked questions
Can a triangle be both isosceles and right?
Yes — a 45°-45°-90° triangle is an isosceles right triangle, and it appears on these sheets.
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