median
don steward
mathematics teaching 10 ~ 16

Friday 19 July 2019

slopes of hills

gradients of steep hills
there was a Guinness record update in July 2019

a powerpoint is here

there are some links (in 'hidden' slides) to youtube clips

there's some difference of opinion about whether it is sinA or tanA (where A is the angle of inclination) that is used as a gradient (slope) measure but it seems (appropriately) to be the tangent of the angle: the elevation distance / horizontal distance

Guinness World Records sets out a definition for the steepest street: the
 maximum gradient over a ten metre span, comparing the vertical rise to the horizontal distance

see the wikipedia entry on grade(slopes) here

the quoted slope on road signs appears to be the steepest section of the road rather than an average slope over the length of it







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