The perimeter of an equilateral triangle is 90 cm. Find its area.
Correct Answer: A) \( \Large 225\sqrt{3} \)sq cm |
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Description for Correct answer:
Given that, perimeter = 90 cm
=> 3a = 90 cm
Therefore, \( \Large \frac{90}{3}=30 cm \)
Therefore, Area =\( \Large \frac{\sqrt{3}}{4}a^{2} = \frac{\sqrt{3}}{4} \times \left(30\right)^{2} \)
=\( \Large \frac{900 \times \sqrt{3}}{4} = 225\sqrt{3} sq.cm. \)
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>> Elementary Mathematics >> Area and perimeter