2 Answers

Tapan · Answer 1 · 2019-11-15T16:45:55+0000

we know that
The measure of the external angle is the semi-difference of the arcs that it covers.
so
m∠BCD=(1/2)*[arc AE-arc BD]
20=(1/2)*[85-BD]
40=85-BD
BD=85-40
BD=45°

the answer is
BD=45°

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