Question

a 20 foot ladder,when rested against a vertical wall touches a point 4 feet below the top the wall. the angle of elevation of the top of the wall at the foot of the ladder is 45 degrees. the height of the wall is

Answer 1

Step-by-step explanation:

Let the height of wall be h

sin45= h/20

1/root 2= h/20

h. =10× root 2