Question 212901This question is from textbook Chemistry & Chemical Reactivity
: A compact disk has a diameter of 11.8 cm. What is the surface area of the disk in square centimeters? In square meters?
This question is from textbook Chemistry & Chemical Reactivity
Answer by drj(1380)   (Show Source):
You can put this solution on YOUR website! A compact disk has a diameter of 11.8 cm. What is the surface area of the disk in square centimeters? In square meters?
Step 1. The surface area is given as
Surface area = pi * (radius)^2 = pi * (diameter/2)^2 = pi * (diameter)^2/4
Step 2. Let S = surface area, d= diameter and pi=3.14159
Step 3. S = pi * (11.8)^2/4 = 109.4 cm^2 (Answer in square centimeters)
Step 4. Since 1 m = 100 cm, then
(1 m)^2 = (100 cm)^2 = 10000 cm^2
Step 5. (109. cm^2)(1 m^2)/10000 cm^2)= (1.09/100) m^2 = 0.0109 m^2 (Answer in square meters)
I hope the above steps were helpful.
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http://www.FreedomUniversity.TV/courses/Trigonometry.
Good luck in your studies!
Respectfully,
Dr J
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