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Question from Karan, a student:

We are given 2 circles with radii 12cm and 3 cm. We have to find AB

Here is the diagram Karen sent

circles

Karan,

I labeled some points on your diagram.

circles

P is the point where the circles are tangent.

Draw the line segments CP and PD. CPD is a straight line. Do you see why? If you draw one more line Pythagoras will give you the length of the line segment AB.

Penny

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