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Classifying Shapes — Easy Worksheet 1
Grade 5 · MathSheets Name: ____________________ Date: __________
Classify triangles by their sides: equilateral (all 3 sides equal), isosceles (exactly 2 sides equal) or scalene (no sides equal). The pictures are not drawn to scale.
How to solve
Compare the three side lengths. If all three are equal, the triangle is equilateral; if exactly two are equal, it is isosceles; if no sides are equal, it is scalene.
Example
A triangle has sides of length 5, 5, and 5. Classify the triangle by its sides.
Answer: equilateral
Warm-up
Not quite. The answer is
💡 All three sides are 6, so it is equilateral.
✓ Correct!
Not quite. The answer is
💡 All three sides are 6, so it is equilateral.
💡 How to solve: Classifying Shapes
Compare the three side lengths. If all three are equal, the triangle is equilateral; if exactly two are equal, it is isosceles; if no sides are equal, it is scalene.
Try a similar one
A triangle has sides of length 5, 5, and 5. Classify the triangle by its sides.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 All three sides are different lengths, so it is scalene.
✓ Correct!
Not quite. The answer is
💡 All three sides are different lengths, so it is scalene.
💡 How to solve: Classifying Shapes
Compare the three side lengths. If all three are equal, the triangle is equilateral; if exactly two are equal, it is isosceles; if no sides are equal, it is scalene.
Try a similar one
A triangle has sides of length 2, 2, and 2. Classify the triangle by its sides.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Picture it
Not quite. The answer is
💡 The sides are 7, 5 and 9. All three sides are different lengths, so it is scalene.
✓ Correct!
Not quite. The answer is
💡 The sides are 7, 5 and 9. All three sides are different lengths, so it is scalene.
💡 How to solve: Classifying Shapes
Compare the three side lengths. If all three are equal, the triangle is equilateral; if exactly two are equal, it is isosceles; if no sides are equal, it is scalene.
Try a similar one
A triangle has sides of length 2, 3, and 3. Classify the triangle by its sides.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 The sides are 2, 2 and 2. All three sides are 2, so it is equilateral. So the answer is 3.
✓ Correct!
Not quite. The answer is
💡 The sides are 2, 2 and 2. All three sides are 2, so it is equilateral. So the answer is 3.
💡 How to solve: Classifying Shapes
Compare the three side lengths. If all three are equal, the triangle is equilateral; if exactly two are equal, it is isosceles; if no sides are equal, it is scalene.
Try a similar one
A triangle has sides of length 3, 3, and 3. Classify the triangle by its sides.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Think it through
Not quite. The answer is
💡 Two sides are both 4 and the third is 3, so it is isosceles. It is not equilateral, so no.
✓ Correct!
Not quite. The answer is
💡 Two sides are both 4 and the third is 3, so it is isosceles. It is not equilateral, so no.
💡 How to solve: Classifying Shapes
Compare the three side lengths. If all three are equal, the triangle is equilateral; if exactly two are equal, it is isosceles; if no sides are equal, it is scalene.
Try a similar one
A triangle has sides of length 4, 9, and 6. Classify the triangle by its sides.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 A (3, 1, 3): two sides are both 3 and the third is 1, so it is isosceles. B (9, 6, 5): all three sides are different lengths, so it is scalene. C (7, 6, 5): all three sides are different lengths, so it is scalene. So the answer is A.
✓ Correct!
Not quite. The answer is
💡 A (3, 1, 3): two sides are both 3 and the third is 1, so it is isosceles. B (9, 6, 5): all three sides are different lengths, so it is scalene. C (7, 6, 5): all three sides are different lengths, so it is scalene. So the answer is A.
💡 How to solve: Classifying Shapes
Compare the three side lengths. If all three are equal, the triangle is equilateral; if exactly two are equal, it is isosceles; if no sides are equal, it is scalene.
Try a similar one
A triangle has sides of length 6, 8, and 5. Classify the triangle by its sides.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Challenge
Not quite. The answer is
💡 All 3 sides of an equilateral triangle are the same length, so each side is 5 units. Perimeter = 5 + 5 + 5 = 3 × 5 = 15. The answer is 15 units.
✓ Correct!
Not quite. The answer is
💡 All 3 sides of an equilateral triangle are the same length, so each side is 5 units. Perimeter = 5 + 5 + 5 = 3 × 5 = 15. The answer is 15 units.
💡 How to solve: Classifying Shapes
Compare the three side lengths. If all three are equal, the triangle is equilateral; if exactly two are equal, it is isosceles; if no sides are equal, it is scalene.
Try a similar one
A triangle has sides of length 4, 5, and 4. Classify the triangle by its sides.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 The third side is 16 − 6 − 4 = 6 units. So the sides are 6, 4 and 6. Two sides are both 6 and the third is 4, so it is isosceles.
✓ Correct!
Not quite. The answer is
💡 The third side is 16 − 6 − 4 = 6 units. So the sides are 6, 4 and 6. Two sides are both 6 and the third is 4, so it is isosceles.
💡 How to solve: Classifying Shapes
Compare the three side lengths. If all three are equal, the triangle is equilateral; if exactly two are equal, it is isosceles; if no sides are equal, it is scalene.
Try a similar one
A triangle has sides of length 4, 4, and 4. Classify the triangle by its sides.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
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Classifying Shapes — Easy Worksheet 1
Classify triangles by their sides: equilateral (all 3 sides equal), isosceles (exactly 2 sides equal) or scalene (no sides equal). The pictures are not drawn to scale.