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Diano4ka-milaya [45]
3 years ago
7

Quall o numero de diagonais de um poligono com 15 lados

Mathematics
1 answer:
Romashka [77]3 years ago
7 0

Answer:

90 diagonais.

Step-by-step explanation:

n(n-3)/2=15(15-3)/2=15*6=90

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Answer:

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Step-by-step explanation:

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Find the values of x and y that make the following quadrilateral a parallelogram.
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Answer:

x = 3 and y = 14

Step-by-step explanation:

opposite angles of a parallelogram are congruent. Hence,

1) 7y + 2 = 6y + 16

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2) 8x + 8 = 6x + 14

I. e. 8x - 6x = 14 - 8

I. e. 2x = 6

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3 years ago
Find the sum of the geometric sequence –3, 15, –75, 375, … when there are 8 terms
arlik [135]
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a(n) = a(1) r^(n-1)
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S(n) = a(1) ( 1 - r^n) / 1-r
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Answer:

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Step-by-step explanation:

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