St#2 Circles (Part 1)
.
- 1.It is the set of points in a plane whose distances from a fixed point is a constant.
- A.
Circle
- B.
Ellipse
- C.
Hyperbola
- D.
Parabola
- 2.The fixed point of the circle is called
- A.
Chord
- B.
Center
- C.
Radius
- D.
Point of tangency
- 3.The distance from the fixed point to any point on the circle is
- A.
Chord
- B.
Diameter
- C.
Radius
- D.
Tangent line
- 4.Which is the equation of a circle in standard form whose center is the origin?
- A.
X2 + y2 = r
- B.
X2 + y2 = r2
- C.
X2 + y2 - r = 0
- D.
X2 + y2 - r2 = 0
- 5.What is the radius of the circle defined by x2 + y2 = 81?
- A.
3
- B.
9
- C.
92
- D.
81
- 6.What is the center of the circle 3x2 + 3y2 = 12
- A.
(0,0)
- B.
(3 ,4)
- C.
(-3, 4)
- D.
(-3, - 4)
- 7.
What is the equation of the circle?- A.
X2 + y2 = 0
- B.
X2 + y2 = 3
- C.
X2 + y2 = 6
- D.
X2 + y2 = 9
- 8.What is the equation of the circle whose center is at the origin and radius is square root of 10
- A.
X2 + y2 = 3.2
- B.
X2 + y2 = 10
- C.
X2 + y2 = 100
- D.
10x2 + 10y2 = 10
- 9.
What is the equation of the circle
- A.
(x - 2)2 + (y - 1)2 = 9
- B.
(x + 2)2 + (y - 1)2 = 9
- C.
(x + 2)2 + (y + 1)2 = 9
- D.
(x - 2)2 + (y + 1)2 = 9
- 10.What is the equation in general form of the circle whose center is (-4, 5) and radius is 4
- A.
X2 + y2 - 8x +10y + 25 = 0
- B.
X2 + y2 + 8x -10y + 25 = 0
- C.
X2 + y2 + 8x -10y + 41 = 0
- D.
X2 + y2 + 8x +10y - 41 = 0
- 11.What is the center of the circle x2 + y2 +2x - 4y = 20
- A.
(1, 2)
- B.
(-1 ,2)
- C.
(-1, -2)
- D.
(1, -2)
- 12.What is the radius of the circle x2 + y2 + 2x - 4y = 20
- A.
4.5
- B.
5
- C.
20
- D.
25
- 13.What is the equation in standard form of a circle whose center is (2, -3) and diameter is 10
- A.
(x - 2)2 + (y + 3)2 = 25
- B.
(x + 2)2 + (y - 3)2 = 25
- C.
(x - 2)2 + (y + 3)2 = 100
- D.
(x + 2)2 + (y - 3)2 = 100
- 14.What is the radius of the circle whose center is at (- 4,_1) and tangent to the x - axis
- A.
1
- B.
2
- C.
3
- D.
4
- 15.What is the general form of equation of the circle (x + 5)2 + (y - 6)2 = 4
- A.
X2 + y2 + 10x + 12y + 57 = 0
- B.
X2 + y2 - 10x + 12y + 57 = 0
- C.
X2 + y2 + 10x - 12y - 57 = 0
- D.
X2 + y2 + 10x - 12y + 57 = 0
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