Question

circumference of circle whose diameter are 12.8​

Answer 1

Answer:

40.21

Step-by-step explanation:

diameter = 12.8

radius = 12.8/2

          = 6.4

circumference of a Circle = 2πr

or, circumference of a Circle = 2*22/7*6.4

or, circumference of a Circle = 40.21

Answer 2

Answer:

Circumference = 2*(pie)*r

Now , we know that d = 2r

thus circumference=(pie)*d

d given as 12.8.

hence c= pie * 12.8

22/7 * 12.8

=40.3 (estimated value)

hence estimated answer is 40.3