Question

What is the circumference of 8?

Answer 1

Depends what it is that is 8
See explanation

Explanation:

Suppose 8 is the radius of a circle

Let the radius be `r`

Then circumference of the circle `=color(brown)(2color(black)(pi)r) = 2pi8=16pi`

`16pi` is an exact answer.

If we use rounded decimals then the answer is not exact.

`16pi~~ 50.27` to 2 decimal places
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Note that the diameter is `2xxr ->color(brown)(2r)`

Suppose 8 is the diameter of a circle

Let the diameter be `D`

Then circumference of the circle `=piD = pixx8=8pi`

`8pi` is an exact answer.

If we use rounded decimals then the answer is not exact.

`8pi~~ 25.13` to 2 decimal places