Question

In a Quadrilateral STUV, angle S=40°, angle T=60° and angle U=60°.Find angle V. Is this Quadrilateral a convex or a concave​

Answer 1

Sum of angles of a quadrilateral is 360 degree

Let angle V be x

So S+T+U+V=360

So 40+60+60+x=360

x=360-140

x=220

This quadrilateral is concave as its one angle is more than 180 degree

I hope this helped you.