C-10-Q158mediumsingle_mcq
From the same observation point on the ground, the angle of elevation of a fixed tower top is determined uniquely by the geometry, so changing the angle while keeping the point and tower fixed is—
From the same observation point on the ground, the angle of elevation of a fixed tower top is determined uniquely by the geometry, so changing the angle while keeping the point and tower fixed is—
- aimpossible — the angle is fixed
- balways possible by walking
- cpossible only at sunset
- dpossible only on slopes
ব্যাখ্যা
With the observation point and tower both fixed, the height and horizontal distance are constant, so gives a single fixed value. The angle cannot change unless the point or tower moves.