The three angles of a quadrilateral are 90°, 60° and 80°. What is the fourth angle?

140°

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150°

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130°

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100°

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Solution

The correct option is C 130°
According to angle sum property of a quadrilateral,
the sum of all the interior angles of a quadrilateral is 360°.

$∴$ Fourth angle = 360°- (90°+60°+80°)
$\Rightarrow$ Fourth angle = 360°- 230° = 130°

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The three angles of a quadrilateral are $40^{\circ}, 80^{\circ}, 90^{\circ}$ . The fourth angle is:

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