Perimeter= a+b+c 42=18+10+c 42=28+c 42-28=c 14=c Semi-perimeter=42/2=21 Area of triangle=root s(s-a)(s-b)(s-c) =Root 21(21-18)(21-10)(21-14) Root 21.3.11.7 Root 3.7.3.11.7 3.7root 11 21root11cm square

3Thank You

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