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