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Hi,
find the angle made by a ladder of length 4m with the ground
if its one end is 2m away from the wall and the other end is on the wall

cos θ = adj/hyp = 2m/4m = 1/2 , θ = 60°
θ radians sin θ cos θ tan θ
0° 0 0 1 0
30° π/6 1/2 √3/2 √3/3
45° π/4 √2/2 √2/2 1
60° π/3 √3/2 1/2 √3
90° π/2 1 0 ─