2. This house has an interesting root. The left side has two different slopes. Dark Vectorangel/5359582/Fotolia a. Calculate the pitch of the top part of the roof's left side. Write your answer in ratio form. Answer: b. Calculate the pitch of the bottom part of the roof's left side. Write your answer in ratio form. Answer: . A stretch of road going down into the Frenchman River Valley in southwestern Saskatchewan has a percent grade of 8%. If the stretch of road is 1500 m long, how deep is the valley? HINT: You can use the formula . percent grade = lise x100% run You might also find that drawing a sketch is helpful.