The three angles of the quadrilateral are 55°, 65°, and 105°. What is the fourth angle ?

125°

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105°

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135°

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115°

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Solution

The correct option is C 135°
The sum of four angles of a quadrilateral is 360°.
The sum of given three angles = 55° + 65° + 105° = 225°
Therefore, the fourth angle = 360° - 225° = 135°
Hence the correct answer is Option A - 135°

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