The diagram shows a ladder leaning against a vertical wall. The ladder stands on horizontal ground. The length of the ladder is 225 cm. The ladder is safe to use when the angle marked y is 75 degrees.
a) Is the ladder safe to use when it is 70 cm from the base of the house?
b) How far from the base of the house the foot of the ladder is placed when it is in a safe position? Give your answer to the nearest cm.
c) What is the height the ladder can reach up the wall when it is in a safest position? Give your answer in cm.