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27 May 2019, 01:46
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D
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74% (00:57) correct
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For the circle \((x-1)^2 + (y+1)^2 = 20\) in the xy-plane, what is the area of the circle ?
A. \(10 \pi\)
B. \(16 \pi\)
C. \(18 \pi\)
D. \(20 \pi\)
E. \(25 \pi\)
A. \(10 \pi\)
B. \(16 \pi\)
C. \(18 \pi\)
D. \(20 \pi\)
E. \(25 \pi\)
27 May 2019, 02:06
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Bunuel
For the circle \((x-1)^2 + (y+1)^2 = 20\) in the xy-plane, what is the area of the circle ?
A. \(10 \pi\)
B. \(16 \pi\)
C. \(18 \pi\)
D. \(20 \pi\)
E. \(25 \pi\)
A. \(10 \pi\)
B. \(16 \pi\)
C. \(18 \pi\)
D. \(20 \pi\)
E. \(25 \pi\)
Equation of circle is \((x-a)^2\) + \((y-b)^2\) = \(r^2\)
So, \(r^2\) = 20
Area of circle = \(\pi\)\(r^2\) = 20\(\pi\)
Option D
27 May 2019, 05:21
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Bunuel
For the circle \((x-1)^2 + (y+1)^2 = 20\) in the xy-plane, what is the area of the circle ?
A. \(10 \pi\)
B. \(16 \pi\)
C. \(18 \pi\)
D. \(20 \pi\)
E. \(25 \pi\)
A. \(10 \pi\)
B. \(16 \pi\)
C. \(18 \pi\)
D. \(20 \pi\)
E. \(25 \pi\)
eqn of circle ;
x^2+y^2=r^2
r^2=20
so
area pi*r^2
pi*20
IMO D
