using herons formula solutions a=100 b=100 c=160
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s =
a + b + c/2
=
( 100 + 100 + 160 ) = 180 /2
A = √s(s - a)(s - b)(s - c) =
= √180(180 - 100)(180 - 100)(180 - 160) =
= √180·80·80·20 = √23040000
= 4800
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