Lamp cone

Calculate the surface of a lamp shade shaped of a rotary truncated cone with base diameter 32 cm and 12 cm and height 24 cm.

Correct result:

S =  1797 cm2

Solution:

r1=12/2=6 cm r2=32/2=16 cm h=24 cm s=h2+(r2r1)2=242+(166)2=26 cm S=π (r1+r2) s=3.1416 (6+16) 26=1797 cm2



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