Question

Circumference of a circle working out and awnser

Answer 1

Answer: $d = 2.75 cm$

Step-by-step explanation:

The formula for calculating the circumference of a circle is given as :

$C = 2\pi r$ , where r is the radius

or

$C =\pi d$ , where d is the diameter

using the second formula , since we are finding the diameter.

$C=\pi d$

that is

$8.64 = d(\frac{22}{7})$

multiply through by $\frac{7}{22}$

we have :

$d = \frac{7}{22}(8.64)$ $= 2.749090909$

rounded to 2 d.p

$d = 2.75 cm$