Math CentralQuandaries & Queries


Question from Juniper, a student:

Two concentric circles have radii of 4 cm and 8 cm. A segment is drawn so that it is tangent to the smaller circle and a chord of the larger circle. How long is the segment?

Hi Juniper,

Draw a diagram.


A tangent to a circle and the radius of the circle at the point of tangency intersect at a right angle. What does Pythagoras tell you?


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