Question

Find the area of the triangle whoose side are 12,16 and 21 units

Answer 1

`A =` 95.45

Explanation:

`A=s(s﹣a)(s﹣b)(s﹣c)`

`s=a+b+c`

Solving for A

A=1

4﹣
`a4+2(ab)2+2(ac)2﹣b4+2(bc)2﹣c4=1`

4-
`124+2·(12·16)2+2·(12·21)2﹣164+2·(16·21)2﹣214≈95.45123`

≈ 95.45123