Question

find the circumference of the circle with the following radius (take π =22/7 )
(a)14cm
(b)28mm
(c) 21cm
(d) 49m​

Answer 1

Answer:

(i) 88cm

(ii) 176mm

(iii) 132cm

(iv) 308m

Step-by-step explanation:

Circumference of circle = $2\pi r$

(i) r = 14 cm

$Circumference = 2*\frac{22}{7}*14cm\\= 2*22*2cm\\= 88cm$

(ii) r = 28mm

$Circumference = 2*\frac{22}{7}*28mm\\= 2*22*4mm\\= 176mm$

(ii) r=21cm

$Circumference = 2*\frac{22}{7}*21cm\\= 2*22*3cm\\= 132cm$

(iv) r = 49m

$Circumference = 2*\frac{22}{7}*49m\\= 2*22*7m\\= 308m$