Question

which of the following is the best description for the shape outlined in the image? concave decagon concave dodecagon convex dodecagon convex decagon

Explanation:

Step1: Recall polygon definitions

A decagon has 10 sides and a dodecagon has 12 sides. The outlined shape has 10 - pointed star - like shape, so it is a decagon.

Step2: Determine convex or concave

A convex polygon has all interior angles less than 180 degrees and no internal angles that "cave in". A concave polygon has at least one interior angle greater than 180 degrees. The star - shaped figure has angles that "cave in", so it is concave.

Answer:

A. Concave decagon