Question

1. which phrase describes the figure? concave nonagon concave octagon convex octagon convex nonagon

Explanation:

1. First, count the number of sides of the polygon. The figure has 8 sides, so it's an octagon (since an octagon has 8 sides and a nonagon has 9 sides).
2. Then, determine if it's convex or concave. A convex polygon has all interior angles less than 180° and all vertices pointing outwards. This figure appears to have all vertices pointing outwards, so it's convex.

Answer:

C. convex octagon