Question

Can help me solve this problem for topic application of trigonometry

Answer 1

The sides are given of the triangle.

Apply the heron's formula, to find the area of triangle.

`A=\sqrt[]{s(s-a)(s-b)(s-c)}`
`s=(21.6+16.4+12.8)/(2)=25.4`
`A=\sqrt[]{25.4*3.8*9*12.9}=\sqrt[]{11205.972}=105.85sq\mathrm{}cm`

The area of triangle obtained is 105.85 sq.cm.