Question

Work out the circumference of a circle with diameter of 1.8 cm

Take pi to be 3.142 and give your answer to 1 dp

Answer 1

`c = ( \alpha * \pi )/(180) * r \\ \\ c = (360\pi)/(180) * (9)/(10) \\ \\ c = (18\pi)/(10) \\ \\ c = 1.8 * 3.142 \\ \\ c = 5.7`

Answer 2

Answer: 5.7 cm

Explanation:

Circumference.= 2πr

= 2 x 3.142 x 0.9

= 5.7 cm.