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

$c = \frac{ \alpha \times \pi }{180} \times r \\ \\ c = \frac{360\pi}{180} \times \frac{9}{10} \\ \\ c = \frac{18\pi}{10} \\ \\ c = 1.8 \times 3.142 \\ \\ c = 5.7$

Answer 2

Answer: 5.7 cm

Step-by-step explanation:

Circumference.= 2πr

= 2 x 3.142 x 0.9

= 5.7 cm.