If the radii of two circles are 4 cm and 6cm , find the
distance between their centres.
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Answer:
if the circle are co centric the distance is zero, and if the circles arec touching eachother atvsum point then the distance is 6+4=10cm
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A and B are the centres of outer and inner circles.
BC=4 cm and AO=6 cm
∴AC=OC−OA
=(8-6)cm
=2cm
Longest Chord is DE or DC
DC² =AD² -AC²
=6²-2²=32
therefore DC= 4√2
therefore DE= 8√2cm
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