Question

the three angles of a quadrilateral are 60° 80° and 120 degree find the fourth angle is​

Answer 1

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Angle sum property of quadrilateral =360°

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So, let the fourth angle be x.

60°+80°+120°+x°=360°

260°+x°=360°

x°=360°-260°=100°
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Therefore, the fourth angle is 100°.

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Answer 2

Hey there!!★

☆█Solution█☆

Given:-

Three angles of quadrilateral ABCD are 60°, 80° and 120°

Find:-

measure of 4th angle = ?

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We already know that sum of all the interior angles of quadrilateral is 360°…

So, by following this...

<A + <B + <C + <D = 360°

60° + 80° + 120° + <D = 360°

260° + <D = 360°

<D = 360° - 260°

<D = 100°

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