Sam Z. answered • 11/06/20
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Top trianle: 2 sides are =; so 2 sides are =. This makes the top center angle = 50°.
Bottom triangle has 2 = sides; so the 2 angles are =. Back to the center; it's opposite (alternate) of the 50° angle. so the 2 opposite angles are =; each is 50°. So 180-100=80°=x.