Hi,

a 16-foot ladder leans against a wall at a 66 degree angle of elevation.

find the distance from the ladder's base to the wall.

*** cos(66) = adj/hyp =  x/16ft

       x/16ft = cos(66)  

      x = 16cos(66) = 6.5ft , distance from the ladder's base to the wall.

 Note: per picture,∠A = 66°, h = 16  and b the distance from the ladder's base to the wall. 

 

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