Find the circumference of these circles with radius.
1. 77cm
2. 14cm
3. 3.5cm
4. 2.8cm
5. 56cm
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Answer:
1. 77 cm
solve - 2πr = 2 × 22/7 × r
= 2 × 22/7 × 77 cm
= 2 × 22 × 11 cm
= 484cm
2. 14 cm
solve - 2πr
= 2 × 22/7 × 14 cm
= 2 × 22 × 2 cm
= 88 cm
3. 3.5 cm
solve - 2πr
= 2 × 22/7 × 3.5cm
= 2 × 22/7 × 35/10cm
= 2 × 11cm
= 22cm
4. 2.8cm
solve - 2πr
= 2 × 22/7 × 2.8cm
= 88/5cm
= 17.6cm
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