Question

AT Sides of a triangle are cm 45 cm, 39 cm and 42 cm, find its area​

Answer 1

Answer:

AT Sides of a triangle are cm 45 cm, 39 cm and 42 cm, find its area

click above pic

army

Answer 2

Answer:

756 $cm^{2}$

Step-by-step explanation:

perimeter = 45+39+42 = 126cm

semi perimeter = s = 63cm

According to herons formula,

Area = $\sqrt{s(s-a)(s-b)(s-c)}$

        =$\sqrt{63(18)(21)(24)}$

        =9×4×3×7

        = 36×21

        = 756 $cm^{2}$