Geometryhard · Past Paper
The length of sides of a triangle are in the ratio 3:4:5. If its perimeter is 36 cm, what is its area?
A54 sq cm
B48 sq cm
C60 sq cm
D72 sq cm
✓ Correct Answer: A — 54 sq cm
3x+4x+5x=36 => 12x=36 => x=3. Sides are 9, 12, 15. This is a right triangle. Area = 0.5 * 9 * 12 = 54 sq cm.
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