The length of the ramp is dependent on the angle that it forms with the horizontal. Let us denote the angle at which the ramp is inclined to the ground to be A, and the length of the inclined surface to be L.

L*cos A = 20

=> L =...

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The length of the ramp is dependent on the angle that it forms with the horizontal. Let us denote the angle at which the ramp is inclined to the ground to be A, and the length of the inclined surface to be L.

L*cos A = 20

=> L = 20/ cos A

**The length of the inclined surface of a ramp forming an angle A with the ground is 20/cos A feet.**