Juliet Is trying to wrap a can of mixed nuts that is a gift for her little brother. The can has a radius of 8 cm and a height of 10 cm. Approximately how many square centimeters of wrapping paper will cover the gift?
2007-02-19 03:59:35 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
C=3.14(8)=25.12
A=3.14(4)(4)=50.24(2)=100.48
A=10(25.12)=251.2
A=251.2(100.48)
SA=25240.576
AM I RIGHT?
2007-02-19 04:20:09 · update #1
You want to calculate the area of a a rectangle that is 10 cm high, and as wide as the circumference of the can, PLUS the area of the two ends of the can.
Circumference of a circle: pi * (r+r) = pi * 16 = 50.2654816
Height of can: 10 cm.
Total area of curved portion of can: 502.654816
Area of a circle: pi*r*r = 64 * pi = 201.0619264
Total area of two ends: 402.1238528
Total area of curved section and two ends: 904.7786688
As you are wrapping the paper around the cylinder, some overlap is involved. I'd go with the 1000 cm ^ 2 piece.
2007-02-19 04:09:49 · answer #1 · answered by Anonymous · 0⤊ 0⤋
A = 2pi*r^2 + 2pi*rh = 2pi*r*(r+h) = 16pi(8+10) = 288pi cm^2
2007-02-19 04:11:37 · answer #2 · answered by SS4 7 · 0⤊ 0⤋
So what is the formula for surface of a cylinder? Your math book must have a page of formulas, perhaps the front and back inside of the cover? No?! Try this site:
http://library.thinkquest.org/C0110248/geometry/menareacylinder.htm
and I would bookmark it for future reference.
2007-02-19 04:07:24 · answer #3 · answered by lynn y 3 · 0⤊ 1⤋
"Slove may question"???? Was that English?
2007-02-19 04:07:47 · answer #4 · answered by ? 2 · 0⤊ 1⤋