When did the silent movie era end? A.1919 B.1929 C.1939 D.1949
2 answers:
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Answer:
The area of the compact disc is 113.04 square centimeters
Explanation:
A compact disc can be seen simplistically like a <em>circle</em>.
The area of a <em>circle</em> is given by the formula:
.
Where is the ratio between the length of a circle's circumference to its diameter, and it is, approximately,
.
And <em>r </em>is the circle's radius (in this case, <em>the distance from the center of a compact disc to the edge of the disc</em>).
For practical purposes, is usually taken with only few decimals (that is,
).
So, the area of the compact disc is:
.