Geometryeasy · Past Paper
The perimeter of an equilateral triangle is 18 cm. Its area is:
A9 sqrt(3)
B6 sqrt(3)
C18 sqrt(3)
D36 sqrt(3)
✓ Correct Answer: A — 9 sqrt(3)
Side = 18/3 = 6. Area = (sqrt(3)/4)*6^2 = 9 sqrt(3).
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