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Example for calculations for the
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The first step, when the length of the edge is not given:
The data h and r are enough. The edge of the cone can be calculated with the
help of the theorem of Pythagoras: s =
The second step:
calculation of the perimeter of the base:
The third step: calculation
of the perimeter of the circle with the radius:
The fourth step:
calculation of the portions of the small circle from the bigger one:
The fifth step: proportion
of the smaller circle times the area of the circle with the radius s:
The sixth step: The coat
multiplied with the area of the cones base:
The surface of a cone with the radius r = 3 and the height h = 4 amounts to 75,4 cm².
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