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    NationalHardGeometry7–9

    A cone has radius 33 cm and height 44 cm. What is its slant height?

    Um cone tem raio 33 cm e altura 44 cm. Qual é a sua geratriz?

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    Solution

    Slant height =r2+h2=9+16=25=5= \sqrt{r^{2} + h^{2}} = \sqrt{9 + 16} = \sqrt{25} = 5 cm

    A cone drawn in cabinet projection, standing on its circular base; the far half of the base rim is dashed. Inside, a dashed vertical line of 4 cm joins the centre of the base to the apex, and a solid line of 3 cm runs from that centre out to the rim, with a right angle marked between them. The sloping edge from the apex down to the rim closes that right triangle and is labelled 5 cm.3 cm4 cm5 cm