In quadrilateral ABCD, sides and both have length 10, sides and both have length 17, and the measure of angle ADC is 60^. What is the length of diagonal ?

AMC 8 2005 Problem 9

AMC8 2005 年第 9 题

三角形★★☆☆☆

In quadrilateral ABCD, sides \overlineAB and \overlineBC both have length 10, sides \overlineCD and \overlineDA both have length 17, and the measure of angle ADC is 60^\circ. What is the length of diagonal \overlineAC?

四边形 ABCD 中，边 60°，那么对角线

A.13.5
B.14
C.15.5
D.17
E.18.5

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