Assignment:
A billboard painter has been assigned the task of changing the advertisement on a 20 ft billboard, the bottom is 15ft off the ground, two other sites under the sign,one is 10ft from the base the other is 15ft from the base. If the painter uses the patch that is 10ft from the base, what is the length of the ladder required to reach the bottom of the sign? What is the length required to reach the top? if she uses the ground that is 15ft from the base, what is the length of ladder to reach the bottom of the sign, and what is the length of the ladder to reach the top?
Provide complete and step by step solution for the question and show calculations and use formulas.