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heron's formula
area of triangle =√{s(s-a)(s-b)(s-c)}
as all sides are a then heron's formula will be
√s(s-a)^3
s = a + a+ a ÷2
s = 3a = 90 cm
a = 30cm
√90(90-30)
√8100 - 2700
90 - 51.97
= 38.04 cm^2
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above answer is correct
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