In the above figure,
A
and
B
are centres of the circles shown. The circles intersect at
C
and
D
.Find
+
(
in degree
)
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That makes ∠ A B C = 6 0 ∘
∠ D B C = 2 × ∠ A B C = 1 2 0 ∘
∠ D F C = 2 1 ∠ D B C = 6 0 ∘
∠ C E D + ∠ D F C = 2 × 6 0 ∘ = 1 2 0 ∘