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1. A traffic signal board, indicating 'SCHOOL AHEAD', is an equilateral tria
side a'. Find the area of the signal board, using Heron's formula. If its pern Su
180 cm, what will be the area of the signal board?
th
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Equilateral triangle means all side will be equal. Perimeter=180
a+a+a=180
3a=180
a=60
S=180/2
=90
Area=root over[s(s-a)(s-b)(s-c)]
=root over[90*(90-60)*(90-60)*(90-60)]
=root over[90*30*30*30]
=900cm^2
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