Posted by kim on .
You are buying a ladder for your 30foottall house. for safety, you would like to ensure that the base of the ladder be placed at least 8 foot from the base of the house. What is the shorest ladder you can buy in order to be able to reach to top of your house?

geometry 
Ms. Sue,
Pythagorean Theorem:
a^2 + b^2 = c^2
30^2 + 8^2 = c^2
900 + 64 = c^2
984 = c^2
31.37 = c
You'll need a ladder that's at least 32 feet long.