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2015-11-19T22:35:36+05:30

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Circumference of circle=2πr=πd
15.7=πd
15.7=3.14d
15.7÷3.14=d
5=d
The diameter of the circle is 5cm.
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2015-11-19T22:38:19+05:30
given , 
circumference of the circle = 15.7 cm
therefore , 
circumference = 2πr

15.7 = 2 * 22/7 * r
15.7 = 44/7 * r
15.7 * 7/44 = r
2.49 = r
therefore radius of the circle = 2.49 cm and
diameter of the circle = 2.49 * 2 = 4.98 cm
 therefore the answer is 4.98 cm .
        i hope it helps..........................^_^
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