Question

Three circles of radii 4.8 cm, 3.2 cm, and 5.4 cm touch each other externally. What is the perimeter of the triangle formed by joining the centers of the circles (in cm)? 

A 26.8 Correct Answer Incorrect Answer
B 28 Correct Answer Incorrect Answer
C 27π Correct Answer Incorrect Answer
D 13.5 Correct Answer Incorrect Answer

Solution

Side PQ = 4.8 + 5.4 = 10.2 Side PR = 5.4 + 3.2 = 8.6 Side QR = 3.2 + 4.8 = 8 Perimeter = 10.2 + 8.6 + 8 = 26.8

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