In figure given below , area two concentric circle of radii 6 cm and 4 cm with centre O. if AP is a tangent to the larger circle and BP to the smaller circle and length of AP is 8 cm , find the length of BP.

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Solution

$P O = \sqrt{8^{2} + 6^{2}} = \sqrt{100} = 10 c m$

$P B = \sqrt{10^{2} - 4^{2}} = \sqrt{84} = 2 \sqrt{21} c m$

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In figure given below , area two concentric circle of radii 6 cm and 4 cm with centre O. if AP is a tangent to the larger circle and BP to the smaller circle and length of AP is 8 cm , find the length of BP.

PO=√82+62=√100=10cmPB=√102−42=√84=2√21cm

$P O = \sqrt{8^{2} + 6^{2}} = \sqrt{100} = 10 c m$

$P B = \sqrt{10^{2} - 4^{2}} = \sqrt{84} = 2 \sqrt{21} c m$