What is the geometric property of these 2 angles being equal?

by Lebombo
Tags: angles, equal, geometric, property
Lebombo is offline
Dec24-12, 12:32 PM
P: 135

At time 2:20, the woman says, "Using trigonometry, we know that this angle is the same as this angle."

Which trigonometry or geometry property is she referring to that is needed in order to determine those two angles are equal? Is there a name for it? I don't have a geometry book, but I am interested in learning about it. Any information would be helpful.

Thank you.
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johnqwertyful is offline
Dec24-12, 01:37 PM
P: 308
The sum of the angles in a triangle is 180. a+23.5+90=180 a=66.5
Then a+θ=90 66.5+θ=90 θ=23.5
Lebombo is offline
Dec25-12, 06:52 PM
P: 135
ah, thanks

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