第66章知识
度。”
“you remember what are the properties of two similar triangles?“
“yes,“ replied herbert;“their homologous sides are proportional.“
“well, my boy, i have just constructed two similar right-angled triangles; the first, the smallest, has for its sides the perpendicular pole, the distance which separates the little stick from the foot of the pole and my visual ray for hypothenuse; the second has for its sides the perpendicular cliff, the height of which we wish to measure, t
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