Respuesta :

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Answer:

There are 7 sides

Step-by-step explanation:

You can use the formula for finding the sum of the interior angles:

S=180(n−2) where n  is the number of sides

If the sum is 900° we have:

180(n−2)=900

n−2=900/180

n−2=5

n=5+2=7

There are 7 sides.

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