2. Find the area of the circles with the following 22 radii. Take = 7. 7 a. 28 cm
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Find the circumference of the circles with the following radius: (Take π =22/7)
(a) 14 cm (b) 28 mm (c) 21 cm
Solution:
(a) Circumference of the circle = 2πr
= 2 × 22/7 × 14 cm
= 2 × 22 × 2 cm
= 88 cm
(b) Circumference of the circle = 2πr
= 2 × 22/7 × 28 mm
= 2 × 22 × 4 mm
= 176 mm
(c) Circumference of the circle = 2πr
= 2 × 22/7 × 21 cm
= 2 × 22 × 3 cm
= 132 cm
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