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Secant Intersection with Two Internally Tangent Circles

​
∠BAD
≈
69.02°
∠CAE
≈
69.02°
If two circles are internally tangent at point A and a secant intersects the circles at B, C, D, and E, then
∠
BAD =
∠
CAE.
Drag the orange points to change the figure.
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