Question

Give below are the measures of 3 exterior
angles of a quadrilateral. Find the measures
of the fourth angle. Identify which
following are concave quadrilaters
A. 29°, 84°, 113°
B. 109°, 69°, 59°
C. 67°, 19°, 63°
​

Answer 1

Sum of exterior angles of a quadrilateral is 360 degrees

A. Fourth angle = 360 - (29+84+113) = 360 - 226 = 134 degrees

B. Fourth angle = 360 - (109+69+59) = 360 - 237 = 123 degrees

C. Fourth angle = 360 - (67+19+63) = 360 - 149 = 211 degrees

Hope it helps