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please solve quickly ​

Please Solve Quickly class=

Sagot :

Answer:

11.17

Step-by-step explanation:

circumference of a circle is found with
C = 2 * pi * r
C = 2 * pi * 8
C = 16 * pi
C = 50.27
360 / 80 = 4.5
50.27 / 4.5 = 11.17