Question

the cicurfamce of two concentric circle are 176cm andb 132cm represintevly what is the difference between their radii

Answer 1

answer...If R and R' be the radii of two circles

∴2πR−2R

′

=176−132

2π(R−R

′

)=44

∴R−R

′

=

2×22

44×7

=7m

Answer 2

given

• circumference of two circle is 176 cm and 132 cm

To find

• difference between their radius ??

solution

circumference of a circle is 2πr

radius of circle 1

2πr=176

πr=88

22/7r=88

r=4*7

R=28 cm

radius of circle 2

2πr=132

πr=66

22/7r=66

r=21 cm

difference is

R-r

=28-21

=7 cm

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