Question

Find the missing side or angle.

Round to the nearest tenth.
b=3
a=9
c=11
C= ?

Answer 1

C=125°

Explanation:

Hi there!

To find angle C, we can use the cosine law:

`cosC=(a^2+b^2-c^2)/(2ab)`

Plug in the given information

`cosC=(9^2+3^2-11^2)/(2(9)(3))`

`cosC=(-31)/(54)`

`C=cos^-^1((-31)/(54))`

`C=cos^-^1((-31)/(54))\\C=125`

Therefore, angle C is approximately 125 degrees.

I hope this helps!