Question

Which of the following quadrilaterals are convex
and which are concave? Explain how you arrive
at your conclusion.​

Answer 1

Answer:In a concave quadrilateral at least one angle is a reflex angle, an angle larger than 180°. In figure, ABCD is a concave quadrilateral because a line joining the vertices A and C is going outside the quadrilateral region.

Step-by-step explanation:

Answer 2

Answer:

Concave is which angle is more than 180°

Convex is which angle is less that 180°

This is concave as you can see part Y is bent inwards so it is probably more than 180°