Question

If radius =4.5cm then circumference of circle is ​

Answer 1

Answer:

R= 4.5 cm

D= 2r

D= 2×4.5

D =9cm

Hope it help you....

Answer 2

Answer:

radius or r = 4.5 cm

circumference is c

so,

$c = 2\pi \times r \\ = 2 \times \frac{22}{7} \times 4.5 \\ = 2 \times \frac{22}{7} \times \frac{45}{10} \\ = 2 \times \frac{22}{7} \times \frac{9}{2} \\ = 2 \times \frac{11}{7} \times 9 \\ = \frac{198}{7} or \: \: 28 \frac{2}{7}$

so, circumference is 198/7 cm

Hope this helps you.