In the figure, if AB = 10, what is the length of the side CD ?
(A) 5
(B) 5 Root(3)
(C) 10 /Root(3)
(D) 10
(E) 10 Root(3)
Answer : c
(A) 5
(B) 5 Root(3)
(C) 10 /Root(3)
(D) 10
(E) 10 Root(3)
Answer : c
This question uses the properties of right triangles that are in the ratio of 1:sqrt(3):2
Since AC = sqrt(100-25) = 5*sqrt(3). This tells us angle x = 30. Therefore Angle D is 60. Using the above ratio, if EC is 10, then DC = 10/sqrt(3)
