3 years ago

Find the sum of interior angles a polygon has with the given number of sides a.9 b.19

Mathematics

1 answer:

Gnom [1K]3 years ago

4 0

The equation for this is (n-2) x 180

Replace n with the number of sides:

a. 9: (9-2) x 180 = 7 x 180 = 1,260

b. 19: (19-2) x 180 = 17 x 180 = 3,060

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ANSWER

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The sum of the first $n$ terms of a geometric sequence is given by;

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Where $n$ , is the number of terms and $a_1$ is the first term.

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$S_5=\frac{81(1-\frac{1}{59049})}{1-\frac{1}{9}}$

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