From point A, the angle of elevation to the top of a tall building is 20°. On walking 80m towards the building, the angle of elevation is now 23°. How tall is
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So walking up hill is harder than walking level, but doesn't gravity pull the body vertical not back towards the bottom of the hill? - Quora
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A treatise on highway construction . rains atthe foot of the side slopes. In others a narrow trench has beenexcavated, parallel to the axis of the road, from the top surface toa
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