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How to solve with work

How to solve with work-example-1
User Otopic
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Answer:

105

Explanation:

In this triangle the arc marks at B and C indicate equal angles. Since a is 30 and a triangle must add to 180, you can subtract 30 from 180 and divide the result in 2. 180 - 30 = 150. 150/2 = 75. Each angle is 75.

The angle you need to know is outside the triangle. It forms a straight line with 75. Every straight line is 180. So if 75 is part of it, the rest is 180 - 75 = 105.

User Sorianiv
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