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Question

The area of an equilateral triangle is 4 3 cm2. Its perimeter is

(a) 9 cm (b) 12 cm (c) 123 cm (d) 63 cm

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Solution

The area of an equilateral triangle of side a = 3a24

43=3a24

a2=16

a = 4 cm.

Hence the side of the equilateral triangle = 4 cm.

Perimeter = 3a=3×4=12


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