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Question

The perimeter of an equilateral triangle is 60 cm, then the area is

A
103 cm2
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B
153 cm2
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C
203 cm2
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D
1003 cm2
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Solution

The correct option is D 1003 cm2
Given
perimeter =60 cm
semi perimeter =602=30 cm.
Therefore the length of each side.

a+a+a=60
3a=60
a=603
a=20
Area = s(sa)(sb)(sc)

Area = 30(3020)(3020)(3020)

Area = 30×10×10×10

Area = 3×10×10×10×10

Area =10×103

Area = 1003 cm2

so, the answer is D. 1003 cm2

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