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frika

The polygon in option 3 is not octagon at all, it is heptagon (or 7-sided polygon).

A convex octagon has no angles pointing inwards. More precisely, no internal angles can be more than 180°.

When some internal angle is greater than 180°, it is concave.

In option 2 you can see that one angle is pointing inward, then this octagon is concave.

Answer: correct choice is B.

ajeigbeibraheem

The one that is a concave octagon from the figure attached can be seen in the second option.

What is a concave polygon?

A concave polygon is a polygon that is not convex in nature(i.e. a polygon that has an interior angle that is greater than 180°).

From the image given below:

  • The first image is an octagon (a polygon with 8 sides)
  • The second image is an octagon (a polygon with 8 sides)
  • The third image is a heptagon (a polygon with 7 sides)

Now, from two octagons:

The octagon whose angle pointing inward usually has an interior angle greater than 180° and can be seen in the second option.

Learn more about concave polygon here:

https://brainly.com/question/17691215

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