Question

1. Find the circumference and area of a circle of
(1) radius 14 cm
(ii) radius 2.1 m
(111) diameter 35 cm
(iv) diameter 77 cm.​

Answer 1

Step-by-step explanation:

1.c = 2πr = 2×22/7×14

= 2×44

= 88cm

A= πr2 =22/7×14×14

= 44×14

= 614sq cm

2.

cir=2πr=2×22/7×2.1

=0.6×22

=13.2m

area=πr2=22/7×2.1×2.1=

13.86 sq m

3.) diameter=35

so,radius=35/2

cir=2πr=2×22/7×35/2

=110cm

area=πr2=22/7×35/2×35/2

=962.5sq cm

4.) diameter =77

so, radius=77/2

cir= 2πr=2×22/7×77/2

=121×2

=242cm

area=πr2=22/7×77/2×77/2

= 121×27/2

=4658.5sq cm

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