Find the angle of least nonnegative​ measure, θC​, that is coterminal with θ=−520°.

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12

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a triangle's   full angle is 180 degrees so 180 - 156 = 24. 24/2=12

geometry: triangles

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call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

25.45584

sorry man i accidentally pressed yes my bad

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