A ladder 20m long rests against a vertical wall so that the foot of the ladder is 9 m from the wall
a)find correct to nearest degree the angle that the ladder makes with the wall
b)find correct to 1 decimal place the height above the ground at which the upper end of the ladders touches the wall
draw a diagram, and you can see that
(a) sinθ = 9/20
(b) √(20^2 - 9^2) = ____ m