Question

I need help lol with this problem pls help pls pls pls

Answer 1

Answer:

Step-by-step explanation:

For this triangle, since the angle is included between 2 given sides, the formula will be:

$A =\frac{1}{2}ab*ac*sin(angleA)$

Putting values where they belong:

$A=\frac{1}{2}(10)(12)sin72$

Do all that in your calculator (in degree mode, NOT radian!) to get

A = 57.1 square cm