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If the area of the circle x^(2)+y^(2)+4x...

If the area of the circle `x^(2)+y^(2)+4x+2y+k=0` is `5pi` square cms then k=

A

`-20`

B

20

C

`+-20`

D

0

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The correct Answer is:
D
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AAKASH SERIES-CIRCLES-PRACTICE EXERCISE
  1. The equation of the circle with radius 4 and centres as the midpoint o...

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  2. The circle with centre (1,-3) and radius being the distance between th...

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  3. If the area of the circle x^(2)+y^(2)+4x+2y+k=0 is 5pi square cms then...

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  4. If (2,3) is an extremity of a diameter of the circle x^(2)+y^(2)-5x-8y...

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  5. The line x/a+y/b=1 meets the axis of and y at A and B respectively and...

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  6. Equation of circle with centre (-1,2) and passing through the centroid...

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  7. The centroid of an equilateral triangle is (0, 0) and the length of th...

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  8. Equation of the circle with radius 10 and whose two diameters are x+y=...

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  9. If a circle is inscribed in a square of side 10, so that the circle t...

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  10. Show that the equation of the circle which pass through the points (1,...

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  11. If the abscissae of points A, B are the roots of the equation x^(2) + ...

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  12. The abscissae of two points A and B are the roots of the equation x^(2...

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  13. The circle described on the line joining the points (0,1), (a,b) as di...

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  14. The equation of the circle passing through (3,0) and (0,4) and having ...

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  15. The line x/a+y/b=1 cuts the coordinate axes at a and B a line perpendi...

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  16. A(cos theta, sin theta), B (sin theta,- cos theta) are two points then...

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  17. A circle of radius r passes through the origin and meets the axes at A...

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  18. A rod AB of length 3 units moves vertically with its bottom B always a...

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  19. A square is inscribed in the circle x^(2)+y^(2)-2x+4y-93=0 with its si...

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  20. An equilateral triangle is inscribed in the circle x^(2)+y^(2)=a^(2). ...

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