Question

In a quadrilateral ABCD. angle = 45°,angle B=65°, angle C=50°,find angle D. concave? In this quadrilateral a convex or concave?
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Answer 1

Step-by-step explanation:

a+b+c+d=180°

45°+65°+50°+d=180°

160°+d=180°

d=180°-160°

=d=20°