Question: a ladder 25 m long reaches a window of building 20 m above the ground . then the distance of the foot of the ladder from the building is ?
A)  35 m
B)  45 m
C)  30 m
D)  15 m
E)  25 m
Correct answer: d
Grade: 8 | Topic: Geometry | Difficulty: Medium | Standard: 8.G.B.7