Answer:
see explanation
Explanation:
The measure of arc AE is
AE = 360° - (100 + 40 + 60)° = 360° - 200° = 160°
∠ BCD = 0.5( m arc AE - m arc BD ), that is
x = 0.5(160 - 40) = 0.5 × 120 = 60
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