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September 21, 2014

September 21, 2014

Posted by **Chica** on Thursday, May 19, 2011 at 11:09pm.

A. 8cm

B. 10cm

C. 12cm

D. 13cm

Could please shed some light on how this problem is worked out.

- Geometry -
**Reiny**, Friday, May 20, 2011 at 8:39amdraw a cross-section diagram, that is,

draw a circle with radius 13

draw a chord which is 5 cm from the centre.

Draw a perpendicular from the circle to the plane.

You have 2 congruent right-angled triangles with hypotenuse 13 and side 5,

let the other side be x

x^2 + 5^2 = 13^2

x^2= 144

x = 12

Since the chord is diameter of the circle on the plane, the radius of that circle is 12

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