Question

EXAMPLE 8. The angles of elevation of the top of a tower from two points at disting
'd' and 'b' from the base and in the same straight line with it are complementary. Pre
that the height of the tower is root(ab) .





I just want to know why it has been taken 90°-ø​

Answer 1

Answer:

because Abp is the angle that is ø and the angle made is 90degree