Question

If two circles of radii 8cm and 3 cm touch each other internally .find the distance between their centres

Answer 1

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Radii of first circle = 8

Radii of second circle = 3

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Circumference of 1st circle

= $2×\pi×r$

= $2×3.14×8$

= 50.24

Circumference of 2nd circle

= $2×\pi×r$

= $2×\pi×3$

=18.84

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The distance between their centres is

= 50.24 - 18.84

= 31.4cm

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Answer 2

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Radii of first circle = 8

Radii of second circle = 3

_________________________________

Circumference of 1st circle

= $2×\pi×r$

= 2×3.14×8

= 50.24

Circumference of 2nd circle

= $2×\pi×r$

= 2×\pi×3

=18.84

___________________________________

The distance between their centres is

= 50.24 - 18.84

= 31.4

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