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3 years ago

Some please help put thanks

Mathematics

1 answer:

Nookie1986 [14]3 years ago

4 0

The interior angles of a 9-agon add up to (9 -2)*180° = 1260°. The sum of the given angles is
.. 1139° +x° = 1260°
.. x = 1260 -1139 = 121

The missing angle measure is 121°.

_____
The supplement of each interior angle is its corresponding exterior angle. The sum of exterior angles of any convex polygon is always 360°. Another way to approach this problem is to add the exterior angles.

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Step-by-step explanation:

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Answer:

I would say A

Step-by-step explanation:

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3 years ago

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Stella [2.4K]

Answer:

Step-by-step explanation:

expanding the bracket, we would have

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3 years ago

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