Practice Page 1
Q1. Use Heron's formula to find the area of a triangle when a = 3 cm, b = 5 cm, and c = 4 cm. |
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Q2. What is the area of an equilateral triangle with side 15cm? |
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Q3. Find the area of a triangle two sides of which are 7m and 6m and the perimeter is 22m. |
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Practice Page 2
Q1. Sides of a triangle are in the ratio of 2 : 7 : 5 and its perimeter is 140cm. Find its area. |
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Q2. An isosceles triangle has perimeter 85 cm and each of the equal sides is 25 cm. Find the area of the triangle. |
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Q3. Find the area of triangle ABC, if side AB = 3, BC = 2, CA =4. |
Practice Page 3
Q1. A sign board, indicating ‘Falling Rocks’ is an equilateral triangle with side ‘a’. Find the area of the sign board, using Heron’s formula if its perimeter is 75 cm. |
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Q2. There is a triangular plot. If the sides are 15 m, 11 m and 6 m, find the area triangular plot. |
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Q3. Sides of right angle are in the ration of 3:5:7 and its perimeter is 300m. Find the area of a triangle. |
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