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User Boryn
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If the percentage grade of the road is 5%, it means that for every 100 feet of horizontal distance, the road rises by 5 feet.To find the angle that the road makes with the ground, we can use trigonometry. The tangent of an angle is equal to the opposite side (the rise) divided by the adjacent side (the horizontal distance).In this case, the tangent of the angle we are looking for is equal to 5/100 = 0.05. Taking the inverse tangent (tan^-1) of 0.05, we get the angle:tan^-1(0.05) ≈ 2.86 degreesTherefore, the angle that the road makes with the ground is approximately 2.86 degrees

User Mrvux
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