Value of the missing angle is .

15°

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150°

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105°

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90°

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Solution

The correct option is C 105°
The straight angle looks like:

Given, ∠a = 75°
The angle lies on a straight line.

So, ∠a and the missing angle makes a pair of supplementary angles.

Hence, the missing angle will be =
180° - 75° = 105°.

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