document.write( "Question 136470: A cake has three circular tiers; each is 8 cm high. The tiers have diameters 60 cm, 48 cm, and 36 cm. What is the surface area to be covered by frosting? There is not frosting between layers. \n" ); document.write( "
Algebra.Com's Answer #99965 by ankor@dixie-net.com(22740)\"\" \"About 
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A cake has three circular tiers; each is 8 cm high. The tiers have diameters 60 cm, 48 cm, and 36 cm. What is the surface area to be covered by frosting? There is not frosting between layers.
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\n" ); document.write( "Find the area of the circular top (r=18 cm):
\n" ); document.write( "At = pi*18^2
\n" ); document.write( "At = 1017.876 sq/cm
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\n" ); document.write( "Areas of the sides can be found by multiplying the circumference by the height
\n" ); document.write( "A1 = pi*60*8
\n" ); document.write( "A1 = 1507.964
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\n" ); document.write( "A2 = pi*48*8
\n" ); document.write( "A2 = 1206.372
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\n" ); document.write( "A3 = pi*36*8
\n" ); document.write( "A3 = 904.779
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\n" ); document.write( "Add the areas of the 3 sides + the area of the top: 4637 sq/cm
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