7th Grade Math
posted by Anonymous .
What is the radius of a CD in cm? What\'s the height of a CD cm? What\'s the volume of the CD? What\'s the measure of the radius in the center of the CD to the beginning of the music area and the volume of it? Subtract the answer from Part D from your answer in Part C and find the volume used for the music. How many minutes of music are on the CD? How many minutes are stored in each cubic centimeters of the volume?

7th Grade Math 
Anonymous
Two rectangles are similar the ratio of the lengths of their corresponding sides is 1:2 find the ratio of peremiters of the rectangles then find the ratio of areas

7th Grade Math 
a
It's really straight forward. You measure the radius (distance from the center of the CD to the outside) and the height (measure the thickness of the CD) then you find the area of the CD's surface by multiplying the radius by itself then multiplying your answer times 3.14 or pi (a= (pi)r^2) then when you've found that you multiply it by the height of the CD and you've found the volume. To find how many minutes of music there are you simply find the length of all the music on the CD and you divide that by the volume of the CD.
Respond to this Question
Similar Questions

7th grade
how can I find the volume, height and radius of a CD 
7th grade
find the Volume of a cylinder with a radius of 14 in and a height of 21 in. Then Change Your Answer In Cubic Feet? 
geometry
. Which of the following circles would show the locus of points in a plane 1 unit from the intersection of the lines x + y = 2 and x â€“ y = 4? 
Computer Science 40
Please help me with this homework assignment. I tried everything and it still didn't work. The question is: Use three variables volume, radius, and height to write a program that can be use to calculate the volume of a cylinder. Formula: … 
Math
A hemisphere of radius 7 sits on a horizontal plane. A cylinder stands with its axis vertical, the center of its base at the center of the sphere, and its top circular rim touching the hemisphere. Find the radius and height of the … 
Algebra!!
1.a swimming pool has a radius of 10 feet and a height of 4 feet. What is the volume? 
Calculus I
*Optimization problem* [I don't know how to get to the answer] Problem: You have a cylindrical can with radius 4cm and height 10cm. Inside is a marble with a radius that has to be larger than 0 but less than 4 cm (even the largest … 
Math
The volume of a cylinder is given by formula V= pi(3.14) r^2h where r is base radius and h is height a) the height of a cylinder of radius 5cm and volume 500. Cm^3 B) radius of base of a cylinder of volume 300 cm^3 and height 10 cm … 
Algebra
The volume of a right circular cylinder (think of a pop can) is jointly proportional to the square of the radius of the circular base and to the height. For example, when the height is 10.62 cm and the radius is 3 cm, then the volume … 
MATH
The volume of a cylinder with a radius of 2 feet and a height of 4 feet is 50.2 feet^3. The volume of a cylinder with a radius of 4 feet and a height of 8 feet is 401.9 feet^3. The volume of a cylinder with a radius of 6 feet and a …