seleslpearlt seleslpearlt
  • 19-11-2016
  • Mathematics
contestada

If the area of a circle is 121π square units, what is its diameter?

If the circumference of a circle is 20π units, what is its area?

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syed514
syed514 syed514
  • 20-11-2016
area of a circle is defined as πr2 and the diameter as 2r. Plugin the value and you can solve problem c. As for problem d, circumference is 2πr, plugin the value and solve the equation.
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HomertheGenius
HomertheGenius HomertheGenius
  • 21-11-2016
1 )  A = 121 π 
A = r² π 
r² π = 121 π
r = √ 121 = 11
The diameter: d = 2 r = 2 * 11 = 22 units
2 ) C = 20 π
C = 2 r π
2 r π = 20 π
r = 20 : 2 = 10 units
A = r² π = 10² π = 100 π square units.
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