Find two standard angles between 0° and 360°

Question

Find two standard angles between 0° and 360° whose cosine value is -0.7. 

Round answer to 1 decimal place.

Answer 1

Given cos(θ) = -0.7

Since the value of cos(θ) < 0, there is an angle for this cosine in the
second and third quadrants.

The simplest way to express the angle is to use the arc-cosine function.
This function should be on a graphing calculator.

In the second quadrant, θ = cos-1(-0.7) = 134.4°
In the third quadrant, θ = 360 - cos-1(-0.7) = 225.6°