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Question

Find the area of an equilateral triangle having side 12 cm. [2 MARKS]


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Solution

Concept : 0.5 Mark
Application : 0.5 Mark
Calculation : 1 Mark

Since the triangle is equilateral, all the sides will be equal.

Therefore, semi perimeter of the triangle = a+b+c2=12+12+122=18 cm

Area of the triangle
= s(sa)(sb)(sc)=18(1812)(1812)(1812)=3888=62.35 cm2


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