The temperature in the morning was −3 °F. The temperature dropped 11 degrees by night. What was the temperature at night?
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The area of a shape is the amount of space it can occupy.
<em>The value of r is 13</em>
From the question (see attachment), we have:
--- area of the shaded region
--- the width of the shaded region
The area of the complete circle would be:
The area of the small circle is:
So, the area of the shaded region is:
Substitute known values
Substitute 2 for w
Expand
Open brackets
Cancel out line terms
Divide through by 4
Factor out pi
Divide through by pi
Substitute 22/7 for pi
Using a calculator, we have
Solve for r
Hence, the value of r is 13
Read more about areas of circles at:
