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The entrance door is 24 inches above ground level. I've chosen a ramp angle of 1:12, which means for every 1 inch of vertical rise, there should be 12 inches of horizontal run.
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The entrance door sits 24 inches above the ground. I've decided on a ramp angle of 1:12, meaning that for every 1 inch of height, the ramp will extend horizontally for 12 inches.