Exercise 1
Find the area of the circles whose radii are given below
(a) 21m
(6) 32mm
Find the area of the circles whose diamters are given below
(a) 28 m
(b) 40 cm
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find the area of circle whose radius is
(a) 21 m
area = πr^2
= 22÷7×21×21
=22×3×21
= 1386 m
(b) 32 m
area =πr^2
=22÷7×32×32
=3.14×32×32
=3215.36mm
find the area of a circle whose diameter is
(a)28m
diameter =28m
radius= d÷2
radius= 28÷2
radius = 14
area = πr^2
= 22÷7×14×14
= 22×2×14
=616 m
(b)40 cm
diameter =40 cm
radius = d÷2
radius= 40÷2
radius= 20 cm
area = πr^2
= 22÷7×20×20
= 3.14×20×20
= 1256 cm
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