Question

responde ai pvfff me responde
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Answer 1

É só aplicar as fórmulas ao lado
2) r=d/2, r=10/2=5 cm
C=2 pi r= 2 X pi X 5= 10 pi

3)C= 2 pi r
80=2X pi X r
r= 80/ 2 pi= 40 pi
r=d/2
40 pi= d/2
d=80 pi