#1**+3 **

Hey Maplesnowy!

Since a full circle is 360 degrees and we are missing one angle, we can write an equation to solve for that angle.

Also, a right angle is 90 degrees.

90 + 90 + 150 + x = 360

330 + x = 360

x = 30

The angle you want to solve for is 30 degrees.

I hope this helped,

Gavin.

GYanggg May 3, 2018