1 Mark
ANNUAL EXAM PYQS · CHAPTER 10
Heron's Formula
CBSE Most Repeated PYQs
Solve official Class 9 Annual Examination Questions for Heron's Formula. Click on options to test yourself, or click "Show Solution & Answer" for complete step-by-step working.
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Semi-perimeter of a triangle with sides 8 cm, 11 cm and 13 cm is:
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Area of right triangle with base 6 cm and hypotenuse 10 cm is:
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If side of an equilateral triangle is 6 cm, its area is:
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Assertion (A): Area of triangle with sides 3cm, 4cm, 5cm is 6 cm². Reason (R): Heron's formula states Area = √[s(s-a)(s-b)(s-c)].
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Assertion (A): Perimeter of an equilateral triangle of side 10 cm is 30 cm. Reason (R): All three sides of an equilateral triangle are equal.
2 Marks
Find area of triangle with sides 13 cm, 14 cm and 15 cm.
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Find area of isosceles triangle with equal sides 8 cm and base 6 cm.
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An equilateral triangle has perimeter 60 cm. Find its area.
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Find height of equilateral triangle of side 12 cm.
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Cost of turfing triangular field of base 20 m and height 15 m at ₹5 per m².
3 Marks
Sides of a triangle are in ratio 12 : 17 : 25 and perimeter is 540 cm. Find area.
3 Marks
A triangular park ABC has sides 120m, 80m, 50m. Find area.
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An isosceles triangle has perimeter 30 cm and equal sides 12 cm each. Find area.
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A kite in shape of square with diagonal 32 cm and isosceles triangle of base 8 cm & sides 6 cm. Find total paper used.
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Case Study Scenario: A traffic signal board 'SCHOOL AHEAD' is equilateral triangle with side 'a'. Question: Find area of signal board if perimeter is 180 cm.
4 Marks
Case Study Scenario: Floral design of 16 triangular tiles with sides 9 cm, 28 cm, 35 cm. Question: Find cost of polishing at 50p per cm².
5 Marks
Field is trapezium with parallel sides 25m and 10m, non-parallel sides 14m and 13m. Find area.
5 Marks
Rhombus field with side 30m and diagonal 48m for 18 cows. Find area per cow.
5 Marks