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Question

If the radius of a circle passing through all vertices of a rectangle is 4cm then the length of diagonal is

A
6 cm
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B
8 cm
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C
10 cm
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D
2 cm
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Solution

The correct option is B 8 cm


Given a circle is passing through all the vertices of the rectangle ABCD.

In a cyclic quadrilateral sum of opposite internal angles is 180.

Since BAD=BCD=90, ADB and BDC are semicircles as angle in a semi-circle is 90.

BD is the diameter of the circle and also the diagonal of the rectange.

BD = 2(radius) = 8 cm


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