Posted by Please Help on Tuesday, January 5, 2010 at 11:35pm.
Jamie is forming a cylinder out of two circles and a rectangle. The area of each circle is 4 pi. The diameter of each circle is 4 cm. The height of the rectangle is 6 cm.
Which shows how Jamie could calculate the surface area of the cylinder?
a. 2(4pi)+ 6(4pi)
b. 2(4pi)+ 6(4)
c. 4pi x 4 x 6 pi
d. 4pi x 4 x 6
I chose b the first time. I chose d the second time and was told that I had the wrong answer both times. Will you please explain? Thanks

5th GRADE MATH  Reiny, Wednesday, January 6, 2010 at 12:05am
Visualize a can, cut off the top and bottom,
you now have a hollow cylinder.
Suppose you take snippers and make a vertical cut and spread out the hollow form.
Would you not get a rectangle whose height is the height of the original can and whose length is the circumference of the circle?
looks like a) to me

5th GRADE MATH  shiny linderverde, Tuesday, April 17, 2012 at 7:22pm
u r right b is the corrct ans.
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