Question

the side of a triangle 8 11 and 13 cm find the area of to two decimal places

Answer 1

s=( a+b+c)/2
=( 8+11+13)/2
= 16
area= √s(s-a) (s-b) (s-c)
=√ 16(16-8)(16-11)(16-13)
= √16*8*5*3
=√1920