A7-foot ladder is leaned against a building in such a way that the bottom of the ladder is 4 feet from the base of the wall. find the angle formed between the ladder and the ground.

The ground, the building, and the ladder form a right triangle, in which
the leaning ladder is the hypotenuse.

For the angle between the ladder and the ground, the 4-ft along the ground
is the side adjacent to the angle, and the 7-ft ladder is the hypotenuse.

         (adjacent side) / (hypotenuse) = cosine of the angle.

                                         Cosine(a) = 4/7 = 0.57143... (rounded)

                                                    Angle 'a' = 55.15 degrees (rounded)