find the area of a triangle two sides of which are 18cm and the perimeter 42cm
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Answer:
two sides = 18 cm,18cm
perimeter= 42
18+18+x=42
36+x=42
x= 6cm
herons formula= whole root{s(s-a)(s-b)(s-c)}
s= half of perimeter
=42/2=21
√{21(21-18)(21-18)(21-6)}
= 53.24cm²
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