Question

What is the length of the circumference of a circle with a diameter of 8cm? Use: pi = 3

Answer 1

`C\propto d\\ \\ \therefore \quad C=kd`

When d=1, C=π, therefore:

k=π.

Therefore:

C=πd

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Answer:

When d=8 cm,

C=8π cm

Answer 2

The circumference of a circle is (pi) x (diameter).

If pi were 3, then a diameter of 8 cm would mean circumference = 24 cm.

But 3 is 4.5% too small for pi.