johrenandez
26.08.2019 •
Mathematics
Four times a number is 84 what is the number
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Ответ:
Ответ:
400π
Step-by-step explanation:
The formula for the area of a circle is πr²
First you have to calculate the radius by halving the diameter so radius is 20m.
Then you put in your calculator πx20²
This equals 400π (in terms of pi).