Question 39
The sum of angles of a concave quadrilateral is
a) More than 360∘
b) Less than 360∘
c) Equal to 360∘
d) Twice of 360∘
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Solution
We know that the sum of interior angles of any polygon (convex or concave) having n sides is (n−2)×180∘. ∴ The sum of angles of a concave quadrilateral is (4−2)×180∘=360∘.