Maths Circle and System of Circles Position of Two Circle, Orthogonality, Radical Axis and Radical Centre Single Correct MCQ
Published on: August 14, 2026

If the length of a common internal tangent to two circles is 7, and that of a common external tangent is 11, then the product of the radii of the two circles is:

A
18
B
20
C
16
D
12

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The correct answer is:
A

as we know squaring & subtact

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