How are a angles equal to each other?
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Originally Posted by Toranc3 How are a angles equal to each other? I've completed your sketch such that you have 2 right triangles, marked in grey.
I've marked the right angles with a red dot. The opposite angles which are equal are marked with a green dot.
Use the property that the interior angles of a triangle add up to 180°.
Earboths right triangles are similar
Both have right angle that's why both are same.
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