In the figure given above, to find external $∠$ BCD, minimum number of interior angles to be given is _____.

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Solution

The correct option is B 1
External angle of a triangle is sum of two interior opposite angles . So, the values of two opposite internal angles should be given to find an external angle.
However, ACD is a straight line. Hence, the value of $∠$ BCA is enough to determine the value of $∠$ BCD.

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