Lamp shade

A lampshade is in the form of a frustum of a cone with a slant height of 7 inches and base radii of 3 inches and 7 inches respectively. How much material is used in its construction if 1/4 inch is allowed for the seam?

Final Answer:

S =  227.8 in2

Step-by-step explanation:

s=7 in r1=3 in r2=7 in  s2=s+41=7+41=47 4+41=428+41=428+1=429=7.25 in  S=π (r1+r2) s2=3.1416 (3+7) 7.25=227.8 in2



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solid geometryplanimetryUnits of physical quantitiesGrade of the word problem

 
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