Lines and Angles
ICSE · Class 7 · Mathematics
Most important questions from Lines and Angles for ICSE Class 7 Mathematics board exam 2026. MCQs, short answer, and long answer questions with marks.
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Sample Questions
An angle is 47° 36'. Find its complement.
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42° 24'
Complement = 90° - angle. Write 90° as 89° 60'. Now subtract: 89° 60' - 47° 36' = 42° 24'.
An angle is 93° 28' 43''. Find its supplement.
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86° 31' 17''
Supplement = 180° - angle. Write 180° as 179° 59' 60''. Then subtract: 179° 59' 60'' - 93° 28' 43'' = 86° 31' 17''.
Two angles are supplementary and are in the ratio 13:5. Find the larger angle.
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130°
Let the angles be 13x and 5x. Since they are supplementary, 13x + 5x = 180. So 18x = 180, giving x = 10. The larger angle is 13x = 130°.
An angle is five times its complement. Find the angle.
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75°
Let the angle be x. Its complement is 90 - x. Given x = 5(90 - x). So x = 450 - 5x, hence 6x = 450 and x = 75°.
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