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True [87]
3 years ago
9

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

Mathematics
2 answers:
Marina86 [1]3 years ago
5 0
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.
Afina-wow [57]3 years ago
4 0
Area of a circle is defined as <span>π<span>r2</span></span> and the diameter as 2r. Plugin the value and you can solve problem c. As for problem d, circumference is <span>2πr</span>, plugin the value and solve the equation.
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