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Gyaan Maths
CBSE · Class 6-12
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CBSE Maths · Class 7

Chapter 7: A Tale of Three Intersecting Lines

Name: ________________________
Date: ______________
Marks: ____ / 5

Triangles: properties, angle sum, exterior angle.

Questions

  1. Sum of angles in triangle?
  2. Two angles 80°,40°80°, 40°. Third?
  3. Isosceles has how many equal sides?
  4. Ext. angle at AA if interior angles B=45°,C=65°B=45°, C=65°?
  5. Sides 5, 12, 13 — right?

Extra Practice (Optional)

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Answer Key (For Teachers)

  1. Answer: 180°180°
    Working: Angle sum.
  2. Answer: 60°60°
    Working: 60°60°.
  3. Answer: 22
    Working: Two.
  4. Answer: 110°110°
    Working: Sum.
  5. Answer: Yes
    Working: 52+122=169=1325^2+12^2=169=13^2.
Gyaan Maths · CBSE Class 7 · Chapter 7
Gyaan Maths — CBSE Class 6-12, built for board-toppers.
v1.1 · Sept 2026