Question

Find the circumference of circles with these given radii take π =22/7
A 7cm b 70cm c 35cm d 14cm e 42cm f 1.05cm g 21m h 22m I 28m j 7.7cm

Answer 1

The formula to calculate the circumference of a circle is C = 2πr, where C is the circumference and r is the radius.

Using the given values and the equation above, we can calculate the circumference for each circle:

a) Circumference = 2 * (22/7) * 7 = 44 cm
b) Circumference = 2 * (22/7) * 70 = 440 cm
c) Circumference = 2 * (22/7) * 35 = 220 cm
d) Circumference = 2 * (22/7) * 14 = 88 cm
e) Circumference = 2 * (22/7) * 42 = 264 cm
f) Circumference = 2 * (22/7) * 1.05 = 6.6 cm
g) Circumference = 2 * (22/7) * 21 * 100 = 13200 cm
h) Circumference = 2 * (22/7) * 22 * 100 = 13860 cm
i) Circumference = 2 * (22/7) * 28 * 100 = 17600 cm
j) Circumference = 2 * (22/7) * 7.7 = 48.4 cm

Therefore, the circumferences of the circles are:
a) 44 cm
b) 440 cm
c) 220 cm
d) 88 cm
e) 264 cm
f) 6.6 cm
g) 13200 cm
h) 13860 cm
i) 17600 cm
j) 48.4 cm