A couple want to put up Christmas lights along the roofline of their house. If the front of the house is 100 ft. wide and the roof has a 45degrees pitch, how many linear feet of Christmas lights should the couple buy? Round to the nearest foot.

Please tell me how you did it :) Thanksssss
BTW: It's not my homework. Just trying to learn what's written on the book.

Question

A couple want to put up Christmas lights along the roofline of their house. If the front of the house is 100 ft. wide and the roof has a 45degrees pitch, how many linear feet of Christmas lights should the couple buy? Round to the nearest foot.

Please tell me how you did it :) Thanksssss 
BTW: It's not my homework. Just trying to learn what's written on the book.

anonymous · Answer

|dw:1342924160086:dw|

anonymous · Answer

use special right triangle 45 45 90

anonymous · Answer

With sin formula perpendicular/ hypotenuse we can get both the roof linear length
100 x2^.5