Mathematics teachers normally h??? ? box ?f wooden ?r plastic shapes tucked deep ?n th??r cupboard ?f goodies th?t th?? bring out when teaching th? theories ?f cones ?nd pyramids, b?t mostly these ?r? complete - right up t? th? sharp end. There ?? ? lot ?f mathematics ?n ? cone ?r pyramid, ?f course, b?t ?n everyday life th??r use ?? limited. ??? w?ll find ice cream cones ?nd hanging baskets ?n th? shape ?f ? cone, b?t complete ones h??? t? either b? held ?n th? hand, supported b? strings ?r wires ?r stood ?n th??r bases, all ?f which rather restricts th??r use (unless ??? wish t? purchase thousands ?f road works cones).
?t ?? th? same with pyramids. Again we ?r? limited t? hanging baskets ?nd th? like ?nd unless ??? w?nt t? bury ? pharaoh, th?? d? not h??? ? lot ?f use stood ?n th??r bases.
Enter th? truncated cone ?nd pyramid. ?n simple terms, ? truncated cone ?r pyramid ?? ? full one with th? top removed. If th? cut ?? made parallel t? th? base, th? shape ?? simply called 'truncated'. (If th? cut ?? not parallel t? th? base ?t ?? called 'oblique truncated', b?t these shapes h??? even fewer uses ?n th? construction ?f physical objects than th? full shapes.)
b?t now we ?r? into ? wholly different ball game ?? truncated cones ?nd pyramids ?r? admirably suite t? stacking ?nd we see them everywhere. g?t ???r children t? watch out f?r them ?n garden centres, crockery shops, DIY stores ?nd s? ?n. ? beautiful example ?? th? type ?f drinking mugs th?t ?r? sold with ? small Easter egg. th?? ?r? normally well crafted ?n ? truncated cone shape with ? simple handle added.
I recently saw ? metal dustbin (th? sort used f?r burning papers, garden waste etc) ?n m? local garden centre. th? main component was an upturned truncated cone with legs. th? lid was ? short b?t wide truncated cone with two handles, one ?n each side t? allow space f?r th? chimney which was...???'ve guessed ?t!
Cones with no points ?r? ?l?? used f?r lamp shades, flower pots, fruit bowls, dove cotes, rocket engine nozzles ?nd fez hats, t? name b?t ? few.
Filed: Mathematicstags: times tables, truncated cones, pyramids
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Source: http://education-references.appspot.com/pyramids-and-cones-in-mathematics-lessons/
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