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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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简单题先列出计算公式：1/2*Π*d；条件2直接给出了直径的和，所以直接计算即可，无需单独求出每个圆的直径！！！
题干说的是求AB+BC+CD的长度和 条件2直接给出AD的长度 AD=AB+BC+CD 简单题出错不应该 一定要时刻留意陷阱