There are a lot of Lessons in math. The example of 11.2 angle theorems for triangles is: Find the value of the angle (image attached)?.
What are triangles?
A triangle is known to be a type of polygon that has three edges and three vertices.
To fine the value, not that an angle on a straight line is 180.
So therefore, you subtract the other angles from 180.
It will be 180-90-45= 45.
So therefore, the angle is 45 degree
Learn more about triangles from
https://brainly.com/question/17335144
