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Classifying Angles & Triangles — Easy Worksheet 1
Grade 7 · MathSheets Name: ____________________ Date: __________
Classify each angle or triangle.
How to solve
Angles: acute is less than 90°, right is exactly 90°, obtuse is between 90° and 180°, straight is exactly 180°. Triangles by sides: equilateral (3 equal), isosceles (2 equal), scalene (none equal). Triangles by angles: look at the largest angle; right if it is 90°, obtuse if it is more than 90°, acute otherwise.
Example
Classify this angle: 180°
Answer: Straight
✓ Correct!
Not quite. The answer is
💡 How to solve: Classifying Angles & Triangles
Angles: acute is less than 90°, right is exactly 90°, obtuse is between 90° and 180°, straight is exactly 180°. Triangles by sides: equilateral (3 equal), isosceles (2 equal), scalene (none equal). Triangles by angles: look at the largest angle; right if it is 90°, obtuse if it is more than 90°, acute otherwise.
Try a similar one
Classify this angle: 90°
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 How to solve: Classifying Angles & Triangles
Angles: acute is less than 90°, right is exactly 90°, obtuse is between 90° and 180°, straight is exactly 180°. Triangles by sides: equilateral (3 equal), isosceles (2 equal), scalene (none equal). Triangles by angles: look at the largest angle; right if it is 90°, obtuse if it is more than 90°, acute otherwise.
Try a similar one
Classify this angle: 90°
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 How to solve: Classifying Angles & Triangles
Angles: acute is less than 90°, right is exactly 90°, obtuse is between 90° and 180°, straight is exactly 180°. Triangles by sides: equilateral (3 equal), isosceles (2 equal), scalene (none equal). Triangles by angles: look at the largest angle; right if it is 90°, obtuse if it is more than 90°, acute otherwise.
Try a similar one
Classify this angle: 90°
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 How to solve: Classifying Angles & Triangles
Angles: acute is less than 90°, right is exactly 90°, obtuse is between 90° and 180°, straight is exactly 180°. Triangles by sides: equilateral (3 equal), isosceles (2 equal), scalene (none equal). Triangles by angles: look at the largest angle; right if it is 90°, obtuse if it is more than 90°, acute otherwise.
Try a similar one
Classify this angle: 90°
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 How to solve: Classifying Angles & Triangles
Angles: acute is less than 90°, right is exactly 90°, obtuse is between 90° and 180°, straight is exactly 180°. Triangles by sides: equilateral (3 equal), isosceles (2 equal), scalene (none equal). Triangles by angles: look at the largest angle; right if it is 90°, obtuse if it is more than 90°, acute otherwise.
Try a similar one
Classify this angle: 180°
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 How to solve: Classifying Angles & Triangles
Angles: acute is less than 90°, right is exactly 90°, obtuse is between 90° and 180°, straight is exactly 180°. Triangles by sides: equilateral (3 equal), isosceles (2 equal), scalene (none equal). Triangles by angles: look at the largest angle; right if it is 90°, obtuse if it is more than 90°, acute otherwise.
Try a similar one
Classify this angle: 110°
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 How to solve: Classifying Angles & Triangles
Angles: acute is less than 90°, right is exactly 90°, obtuse is between 90° and 180°, straight is exactly 180°. Triangles by sides: equilateral (3 equal), isosceles (2 equal), scalene (none equal). Triangles by angles: look at the largest angle; right if it is 90°, obtuse if it is more than 90°, acute otherwise.
Try a similar one
Classify this triangle by its sides: 5, 5, 6.
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 How to solve: Classifying Angles & Triangles
Angles: acute is less than 90°, right is exactly 90°, obtuse is between 90° and 180°, straight is exactly 180°. Triangles by sides: equilateral (3 equal), isosceles (2 equal), scalene (none equal). Triangles by angles: look at the largest angle; right if it is 90°, obtuse if it is more than 90°, acute otherwise.
Try a similar one
Classify this angle: 180°
✓ 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 Angles & Triangles — Easy Worksheet 1
Classify each angle or triangle.