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BTGmoderatorDC
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In the figure above, points A, B, C, and D are collinear and AB, BC, and CD are semicircles with diameters d1 cm, d2 cm, and d3 cm, respectively. What is the sum of the lengths of semicircles AB, BC, and CD, in centimeters?
(1) d1:d2:d3 is 3:2:1.
(2) The length of line segment AD is 48 cm.
OA B
Source: Official Guide
