Question

Find the perimeter of a triangle with sides 11 inches, 5 inches, and 13 inches.

Answer 1

ar( ▲ ) = root( s( s-a)(s-b)(s-c))
here s= (a+b+c)/2 = 14.5"
a= 11"
b= 5"
c= 13"

so, area = root( 14.5(14.5-11)(14.5-5)(14.5-13))
= 97.1104397066"^2