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题库 / GMATAdvanced-DS-48
In the figure above, points A, B, C, and D are collinear and AB, BC, and CD are semicircles with diameters d1cm, d2cm, and d3cm, respectively. What is the sum of the lengths of AB,BC and CD in centimeters?
(1)d1:d2:d3 is 3:2:1
(2)The length of AD is 48 cm.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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ab,bc,cd表示的不是弧长，是直线长
是问的弧长吧，只不过弧长也是一样的求，1/2*pai*AD即是
是弧长吧，AB, BC, and CD are semicircles
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