don steward
mathematics teaching 10 ~ 16

Friday 1 March 2013

sphere volume and surface area

a ppt is here

establishing the formulas for the volume and surface area of a sphere (without calulus) are quite tricky

youtube presentation for the volume

youtube presentation for the surface area, reportedly Archimedes' method (225 BCE)

this geogebra presentation shows the pyramid parts (hence the third in the formula for the volume)

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