The angles of elevation of the top of a tower from the points P and Q, at distances of a and b respectively from the base of the tower and in the same straight line with it are complementary. The height of the tower is :

The angles of elevation of the top of a tower from the points P and Q,

1.	The angles of elevation of the top of a tower from the points P and Q, at distances of a and b respectively from the base of the tower and in the same straight line with it are complementary. The height of the tower is :
A.
B.	ab
C.	a
D.	b
Answer» B. ab

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