Question

Find the circumference and area of a circle of i) radius 14 cm ii) radius 2.1m iii) diameter 35 cm iv) diameter 77cm

Answer 1

Answer:

CIRCUMFERENCE OF CIRCLE =

$2\pi \:r$

AREA OF CIRCLE =

$\pi {r}^{2}$

i) r = 14cm

CIRCUMFERENCE =2×22/7×14 = 88 cm

AREA= 22/7×14×14 = 616 cm ^2

ii) r =2.1m

CIRCUMFERENCE =2×22/7×2.1 = 13.2 m

AREA = 22/7×2.1×2.1= 13.86 m^2

iii) d= 35cm r = 35/2cm ( d=r/2)

CIRCUMFERENCE = 2×22/7×35/2= 110 cm

AREA= 22/7×35/2×35/2= 962.5 cm^2

iv) d=77cm, r= 77/2 cm

CIRCUMFERENCE = 2×22/7×77/2= 242 cm

AREA= 22/7× 77/2×77/2= 4685.5 cm^2

Answer 2

Step-by-step explanation:

4685.5 sq m answer

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