Question

Solve for x and length of c

Answer 1

Explanation:

This is a SAS (side, angle, side) Triangle.

`a^2=b^2+c^2-2bc*cosA`

`a^2=61^2+63^2-2(61)(63)*cos(142)`

`a^2=3721+6969-2(61)(63)*cos(142)`

`a^2=3721+6969-2(3843)*cos(142)`

`a^2=3721+6969-7686*cos(142)`

We know that cos145=-0.8 so let's just assume that cos142 also is -0.8 hehehehe

`a^2=3721+6969-7686*-0.8`'

`a^2=3721+6969+6148.8`

16838.8

Square root that too (very roughly), 130.