Question

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Answer 1

I have attached the image URL of a free body diagram. I am wondering if somebody can help me to understand the angles associated with this problem

Answer 2

My question is how to determine that the angles are equal ? whats the rules?

Answer 3

what do all the angles of a triangle add up to?

Answer 4

180, i believe

Answer 5

correct, so lets take the outside tiangle, the biggest one

a + b + 90 = 180, therefore a+b = 90, right?

Answer 6

yes, it must be 90