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In mathematics, a set A is a subset of a set B, or equivalently B is a superset of A, if A is contained in B. That is, all elements of A are also elements of B (note that A and B may be equal).
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by formula of the exterior angle is equal to sum of opposite interior angle.
A) 140-90=50°
B) 150-105=45°
C)90-60=30°
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