阿摩線上測驗
8. What is the sum of all possible values of ? between 0 and 360 such that the triangle in the coordinate plane whose vertices are (cos 50°, sin 50°), (cos 70°, sin 70°), and (cos t°, sin t°) is the isosceles?
(A) 300
(B) 330
(C) 390
(D) 420
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統計： A(4), B(9), C(6), D(13), E(0) #3125586
統計： A(4), B(9), C(6), D(13), E(0) #3125586
