The sum of angles of a concave

Question:

The sum of angles of a concave quadrilateral is

(a) more than 360o 

(b) less than 360o

(c) equal to 360o 

(d) twice of 360o

Solution:

(c) equal to 360o

We know that sum of angles of concave and convex quadrilateral is equal to 360o.

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