



 
Al, The very first step is to draw a diagram. At the top the ladder is touching the wall so I think you want to know how far the base of the ladder is from the wall, that is what is the distance from B to C? Triangle ABC is a right triangle, the length of the hypotenuse is 20 ft and you want to know the length of the side adjacent to the 70^{o} angle. What trig function relates the measure of an angle, the adjacent side and the hypotenuse? Penny  


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