Answer:
Δ ABC is the required triangle.
Step-by-step explanation:
Since the person is standing at the top of tower.
let the height of tower be 'h' and 'b' be the distance from base of tower to the point where keys are dropped.
Consider, ABC be the right angled triangle with AB be the tower and A be the point where person is standing and C denotes the point where keys dropped finally.
Alpha (α) be the angle at which keys is dropped.
BC denotes the distance from foot of tower to the keys.