I don't see an angle.
Do you mean finding angles from a triangle? The three angles have to add up to 180 degrees. If it gives you (for example) 72 degrees and 68 degrees, what's the missing angle? Well, we add 72 and 68 up, then subtract it from 180. Our answer is found!
Hope this helps,
Conor
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10
You find the arc measure and then you divide it in half to find the inscribed angle
It will be half the original angle.
use a protractor
Use a protractor