Question
Two circles have radii of 18 cm and 32 cm, and they touch
each other externally. What is the length of a common tangent between them?Solution
Let the length of the common tangent be ‘d’ cm
Therefore, ‘d’ = 2 × √(r 1  × r 2 ) = 2 × √(18 × 32) = 2 × 24 = 48 cm
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