Question
The three angles of a quadrilateral are 40∘,80∘,90∘. The fourth angle is:
Answer: Option A
:
A
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:
A
According to the angle sum property of a quadrilateral, the sum of all the angles of a quadrilateral is =360∘
∴The fourth angle
=360∘-(40∘+80∘+90∘)
=360∘−210∘
=150∘
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