Answer:
the answer should be 8.9
you square 12 and square the 8 and subtract them by each other
Answer:
2144.66
Step-by-step explanation:
V = 4/3 π r^3
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.
