I can figure out everything but these:
Find the Radius of the base of each right cylinder.
1.The surface area is 628.3 square millimeters and the heaight is 15 millimeters.
2.The surface area is 892.2 square feet and the height is 4.2 feet.
Different thing:
3.Becca made a rectangular jewlery box in her art class and plans to cover it in red silk. If the box is 6 and a half inches long, four and a half inches wide, and 3 inches high, find the surface area that will be covered.
Thanks in advance : )
2007-02-27 10:53:06 · 3 answers · asked by Hiro a Hero? 5 in Education & Reference ➔ Homework Help
628.3/15=pi * D
628.3/15/pi = D
628.3/15/pi/2 = R
R = 6.666
892.2/4.2/pi/2 = R
kamy is correct on the last one
2007-02-27 11:15:53 · answer #1 · answered by tom 2 · 0⤊ 0⤋
I really don't know what grade do u learn that in?
2007-02-27 10:56:45 · answer #2 · answered by Marie 2 · 0⤊ 0⤋
628.3=3.14*(r^2)*15 r^2=628.3/(3.14*15)
892.2=3.14*(r^2)*4.2 r^2=...
A=[2(6.5*4.5+6.5*3+4.5*3)] in^2
2007-02-27 11:05:09 · answer #3 · answered by kamy ch 1 · 0⤊ 0⤋