The angles of elevation of the top of a tower from two points at distances of 4 m and 9 m from....

The angles of elevation of the top
of a tower from two points at
distances of 4 m and 9 m from
the base of the tower and in the
same straight line with it are
complementary. Then the height
of the tower is
(A) 6 m
(B) 10 m
(C) 9 m
(D) More than one of the above
(E) None of the above
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