Herons formula Find the area of an equilateral triangle whose perimeter is 30cm
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answer is 25√2 cm² length of each equal to 10 cm
use this formula- √s(s-a)(s-b)(s-c)
s=a+b+c/2
use this formula- √s(s-a)(s-b)(s-c)
s=a+b+c/2
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