20 Foot Shed Roof Trig Help Again . XD?

Trig help again . XD? - 20 foot shed roof

Hate Trig, especially in math, I'm pretty bad, and now I am review this issue, not that I badly on them, only the really do not want homework this evening. Can someone help me with this

10. the facade of a tool shed in the form of a CAP surmounted by a triangle. The total is 4 m, and each side is 3 meters high. Peak of the triangle is 3.5 m from the bottom of the vessel.

a) What is the measure of the obtuse angle at the top of the roof?
b) What is the length of each side of the roof

11)
A fire truck is equipped with a ladder that can be a maximum length of 30 m, the driver should not park the fire within 15 meters of a building.
a) when the foot is the head of 1 m above the ground can be a firefighterr reach a balcony, 25 meters high
b) If possible, is what the slope of the stair lift?

12) A ramp for the implementation of a ski jump in the water used is 20 meters long and elevation angle 15 degrees. What skiers alititude water for at least the start?