Question
Two circles of radii 8 cm and 3 cm have their centers 15
cm apart. What is the length of the common internal tangent?ÂSolution
The length of the common internal tangent is given by â(d² - (râ - râ)²), where d is the distance between the centers, râ and râ are the radii of the circles. Substituting the values, â(15² - (8 - 3)²) = â(225 - 25) = â200 = 14.14 â 14 cm. Correct answer: c) 14 cm
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