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shtirl [24]
3 years ago
6

Which polygon is a concave octagon?

Mathematics
2 answers:
Bezzdna [24]3 years ago
8 0

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.

Lena [83]3 years ago
3 0
2nd one. it is concave because one of the side goes inside of the octogon.Its pretty easy tbh. Hope it helped.
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Step-by-step explanation:

2500 - 12%

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Galina-37 [17]

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No solution

Step-by-step explanation:

To eliminate is to get rid of one of the variables.

You can choose to either add each term in the equations or subtract each term in the equation.

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Try adding them.

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2y - 2x = 20   No variables were eliminated.

Try subtracting.

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<u>-     y - x = 5</u>

0y - 0x  = 10   All variables were eliminated.

.         0 = 10     This is false.

This system of equations cannot be solved.

Graphically, these two lines would have the same slope and are parallel. The solution to a system is same as the point of intersection. Parallel lines never meet, never intersect, therefore there is no solution.

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