Engineering Board Exam Reviewer · Circles: Chords, Tangents and Secants · easy
Two circles are tangent externally. Their radii are 4 cm and 9 cm. Find the distance between their centers.
- 13 cm
- 5 cm
- 36 cm
- 6.5 cm
Answer
A. 13 cm
Solution
For externally tangent circles, the distance between centers =r1+r2=4+9=13 cm.
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