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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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N. -2x - 40 = 8(1 -x)​
Irina-Kira [14]

Answer:

x=8

Step-by-step explanation:

−2x−40=8(1−x)

Step 1: Simplify both sides of the equation.

−2x−40=8(1−x)

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−2x+−40=8+−8x

−2x−40=−8x+8

Step 2: Add 8x to both sides.

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Step 3: Add 40 to both sides.

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Step 4: Divide both sides by 6.

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4 0
3 years ago
10 is 25% of what number
telo118 [61]
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10 is 25% of 40. 
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