Question

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

Answer 1

Answer:

A=756cm²

Step-by-step explanation:

Using the formulas

A=s(s﹣a)(s﹣b)(s﹣c)

s=a+b+c

2

Solving forA

A=1

4﹣a4+2(ab)2+2(ac)2﹣b4+2(bc)2﹣c4=1

4·﹣454+2·(45·39)2+2·(45·42)2﹣394+2·(39·42)2﹣424=756cm²