Question

the side if triangle are 8 cm 11 cm and 13 cm what us area (in square cm)​

Answer 1

43.8178cm²

Using the formulas

A=s root (s﹣a)(s﹣b)(s﹣c)

s=a+b+c / 2

Solving forA

A=1/4﹣root a4+2(ab)^2+2(ac)^2﹣b4+2(bc)^2﹣c^4=

1/4·﹣root 8^4+2·(8·11)^2+2·(8·13)^2﹣114+2·(11·13)^2﹣13^4 = 43.8178cm²