Question

L
OVA
Exercise 13.20
1. Find the circumference of a circle whose diameter is :
(a) 15.4 cm
. (b) 14 cm
(c) 4.9 cm
2. Find the circumference of each of the circles with the
dius :
(a) 1.2 mm
(b) 10 cm
(c) 9.01 cm
(c) 9.01 cm
(d) 2.7 cm
3. Find the radius of a circle whose circumference is :
(a) 63.8 m
(b) 57.2 cm
(c) 44 cm
4. The ratio of the radii of two circles is 5:3. Find the ratio of their circumferences.​

Answer 1

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Answer 2

1.(a) r=7.7cm
c=2*7.7*22/7
=>48.4cm
(b)r=7cm
c=2*7*22/7
=>44cm
(c)r=2.45cm
c=2*2.45*22/7
=>15.4cm

2.(a)r=0.12cm
c=0.75cm
(b)r=10cm
c=62.8cm
(c)r=9.01cm
c=56.63cm
(d)r=2.7cm
c=16.9cm

3.(a)c=6380cm
r=c*7/22*2
=>1015cm
(b)r=>9.1cm
(c)r=>7cm

4. 5:3