Question

what is the angle the ladder makes with the ground, if 4.5 m long ladder is placed at 1 meter away from the wall

Answer 1

see figure , here it is clearly shown that a ladder makes an angle A with ground.

length of ladder = 4.5 m

a/c to question, ladder is placed 1m away from the wall

now, cosA = base/hypotenuse

= distance of ladder from the wall/length of ladder

= 1/4.5 = 2/9

hence, cosA = 2/9

A ≈ 77.16°

hence, 77.16° is the angle made by ladder with the ground.