Let side of triangle is a,b and c a= 18cm b= 10cm c= x Perimeter of triangle= a+b+c 42=18+10+x 42=28+x x= 42-28 x=14 So, c=14 semi perimeter=a+b+c/2 18+10+14/2 42/2=21 area of triangle by heron's formula √s(s-a)(s-b)(s-c) √21(21-18)(21-10)(21-14) √21x3x11x7 √3x7x3x11x7 (pair by of 3 and 7) 3x7√11 Ans-21√11

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