Solve.A lamp shade has the geometric form as shown. The total surface area of a lamp shade with a slant height s and top and bottom base radii of r2 and r1 is given by  Find an equivalent expression for the total surface area by factoring out a common factor. 

A. ?(r12 + r22 + sr1 + sr2)
B. ?(r1 + r2)(r1 + r2 + sr1r2)
C. ?r1(r1 +  + sr1 + sr2)
D. ?(r1 + r2)(r1 + r2 + s)

Answer: A

Mathematics

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