(A) 3 cm (B) 6 cm
(C) 9 cm (D) 1 cm
As per the inquiry,
OA = 4cm, OB = 5cm
What’s more, OA ⊥ BC
Consequently,
![\[OB2\text{ }=\text{ }OA2\text{ }+\text{ }AB2\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-8f7a4a2879815454446bc720ec1eb9a0_l3.png "Rendered by QuickLaTeX.com")
![\[\Rightarrow 52\text{ }=\text{ }42\text{ }+\text{ }AB2\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-5449d300b9645adaf81309e5a6b3fc08_l3.png "Rendered by QuickLaTeX.com")
![\[\Rightarrow AB\text{ }=\surd \left( 2516 \right)\text{ }=\text{ }3cm\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-c288b5634ff9973460b4024f0c694544_l3.png "Rendered by QuickLaTeX.com")
![\[\Rightarrow BC\text{ }=\text{ }2AB\text{ }=\text{ }2\times 3cm\text{ }=\text{ }6cm\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-73dd946b8c678e7ba376942d2d798141_l3.png "Rendered by QuickLaTeX.com")
If radii of two concentric circles are 4 cm and 5 cm, then the length of each chord of one circle which is tangent to the other circle is
If radii of two concentric circles are 4 cm and 5 cm, then the length of each chord of one circle which is tangent to the other circle is