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If three angles of a quadrilateral are $65 °, 95 ° and 8 0 °$ , then the fourth angle is

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$120°$

$105°$

$95°$

$90°$

answer is D.

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Detailed Solution

Given 3 angles $65°, 9 5°, 80°$

Another 4^thangle $= x$

$65 + 95 + 80 + x = 360 °$

Sum of 4 angles in a quadrilateral

$x = 360 − 240$ $= 120 °$

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