Lampshade

The cone-shaped lampshade has a diameter of 30 cm and a height of 10 cm. How many cm2 of material will we need when we 10% is waste?

Correct result:

S =  934.4918 cm2

Solution:

D=30 cm v=10 cm  r=D/2=30/2=15 cm q=1+10100=1110=1.1  s=v2+r2=102+152=5 13 cm≐18.0278 cm  S1=π⋅ r⋅ s=3.1416⋅ 15⋅ 18.0278≐849.538 cm2 S=q⋅ S1=1.1⋅ 849.538=934.4918 cm2

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