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In the figure above, points A, B, C, and D are collinear and AB , BC sand CD are semicircles with diameters $$d_1$$ cm, $$d_2$$ cm, and $$d_3$$ cm, respectively. What is the sum of the lengths of AB,BC,and CD,in centimeters?

1.$$d_1$$ : $$d_2$$ : $$d_3$$ is 3:2:1.

2.The length of $$\overline {AD}$$ is 48 cm.
  • AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
  • BStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
  • CBOTH statements TOGETHER are sufficient. but NEITHER statement ALONE is sufficient.
  • DEACH statement ALONE is sufficient.
  • EStatements (1) and (2)TOGETHER are NOT sufficient.
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正确答案: B

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