2015.CHP1 圓 班級: 座號: 姓名:
( )01.已知方程式ax2 + 2y2 - 4x +
( )02.自A (1 , 2)向圓x2 + y2 = 2作二切線,切點為P、Q,則△APQ之外接圓方程式為 (A)x2 + y2 + x - 3y = 0 (B)x2 + y2 + 5x - 5y = 0 (C)x2 + y2 + 3x - 4y = 0 (D)x2 + y2 - x - 2y = 0
( )03.方程式x2 + y2 + 2kx - 6y + (k2 + k + 1) = 0圖形為一點,則此點坐標為(A)(4 , 3)(B)( - 4 , 3)(C)( - 8 , 3)(D)(8 , 3)
( )04.設P (1 , - 2)、Q ( - 3 , 1),則以為直徑之圓方程式為 (A)x2 + y2 + 2x - y - 9 = 0 (B)x2 + y2 - 2x + y - 1 = 0 (C)x2 + y2 + 2x + y - 5 = 0 (D)x2 + y2 + 2x - y - 3 = 0
( )05.直線L:y = mx + 2與圓C:x2 + y2 = 1有兩個交點,則m的範圍為 (A) (B)或 (C) (D)或
( )06.圓C:x2 + y2 + 2x - 4y - 4 = 0的參數方程式為 (A) (B) (C) (D),0 £q < 2 p
( )07.圓C:x2 + y2 + 4x + 2y + 1 = 0上任一點到直線3x + 4y - 5 = 0的最長距離為M,最短距離為m,則M - m = (A)4 (B)6 (C)8 (D)10
( )08.設x2 + y2 = 100,則3x + 4y的最大值為 (A)2500 (B)500 (C)50 (D)25 (E)10
( )09.設P (x , y)為方程式x2 + y2 = 25上一點,則3x + 4y + 5的最大值為 (A)30 (B)25 (C)20 (D)15
( )10.圓x2 + y2 + ax + by + c = 0過( - 1 , 1)及(1 , 3)兩點,且圓心在x軸上,則a - b + c = (A) - 10 (B) - 6 (C)1 (D)4
( )11.圓x2 + y2 - 2x + 4y + a = 0之半徑為4,且圓心在直線y = bx上,則a + b =(A) - 13(B) - 14(C) - 15 (D) - 16
( )12.過點(0 , 1),且與x2 + y2 - 6x - 4y + 3 = 0相切之直線方程式為 (A)x - 3y + 3 = 0 (B)3x + 2y - 2 = 0 (C)x + 3y - 3 = 0 (D)3x + y - 1 = 0
( )13.自點(1 , 2),向圓2x2 + 2y2 + 4x + 6y - 1 = 0所作切線段長為 (A) (B)5 (C) (D)
( )14.斜率為,且與圓x2 + y2 - 2x - 6y + 6 = 0相切之切線方程式為 (A)4x - 3y + 15 = 0或4x - 3y - 5 = 0 (B)3x - 4y + 15 = 0或3x - 4y - 5 = 0 (C)4x - 3y - 15 = 0或4x - 3y + 5 = 0 (D)3x - 4y - 15 = 0或3x - 4y + 5 = 0
( )15.過點( - 4 , 4)至圓x2 + y2 - 6x - 6y - 7 = 0之切線方程式的斜率為(A)或(B)或(C)或(D)或
( )16.過點A (1 , 2)向圓x2 + y2 = 4作二切線,令二切點為P、Q,圓心為O,則四邊形APOQ的面積為 (A)8 (B) (C)4 (D)2
( )17.設P (1 , 3)對圓x2 + y2 = 1作二切線,切點分別為A、B兩點,圓心為O點,則的長度為 (A) (B)3 (C)10 (D)9
( )18.在坐標平面上,設圓心在第二象限上的圓與兩坐標軸相切,若圓心在直線3x + 5y = 14上,則此圓的半徑為何? (A)1 (B)3 (C)5 (D)7【094年歷屆試題.】
( )19.設P (1 , 3)對圓x2 + y2 = 1作二切線,切點分別為A、B兩點,圓心為O點,則OAPB的外接圓方程式為 (A)x2 + y2 + x + 3y - 20 = 0 (B)x2 + y2 + x - 3y - 2 = 0 (C)x2 + y2 - x - 3y = 0 (D)x2 + y2 - x + 3y - 18 = 0
( )20.圓心(2 , 1)且與直線3x + 4y - 5 = 0相切之圓方程式為 (A)(x - 2)2 + (y - 1)2 = 1 (B)(x - 2)2 + (y - 1)2 = 4 (C)(x + 2)2 + (y + 1)2 = 1 (D)(x + 2)2 + (y + 1)2 = 4
( )21.若P ( - 3 , 1)為圓x2 + y2 = 10上一點,則過P點的切線斜率為 (A)(B) - 3 (C)3 (D)
( )22.圓心( - 4 , - 3)且與y軸相切,則圓方程式為 (A)(x - 4)2 + (y - 3)2 = 25 (B)(x + 4)2 + (y + 3)2 = 25 (C)(x + 4)2 + (y + 3)2 = 16 (D)(x + 4)2 + (y + 3)2 = 9
( ) 23下列何者為圓x2 + y2 = 16的切線? (A)x + 16 = 0 (B)x - 16 = 0 (C)y = 0 (D)y + 4 = 0
( ) 24.已知直線3x + 4y + 1 = 0與圓x2 + y2 + 2x - 6y - 5 = 0交於A、B兩點,則 (A)2 (B) (C) (D)【092年歷屆試題.】
( )25.圓(x - 1)2 + (y + 3)2 = 16與直線3x + 4y - 11 = 0的交點有多少個?(A)0(B)1 (C)2 (D)3【093年歷屆試題.】
( )26.若圓C的方程式為x2 + y2 - 6x - 4y + 4 = 0,則下列各方程式的圖形,何者與圓C相切? (A)3x + 4y - 1 = 0 (B)3x + 4y - 2 = 0 (C)3x + 4y - 7 = 0 (D)3x + 4y - 14 = 0【098年歷屆試題】
( )27.已知直線L:3x + 4y + 5 = 0與圓C:x2 + y2 + 2x - 4y - 4 = 0兩者的交點個數為a,且圓C的圓心到直線L的距離為b,則下列何者為正確? (A)a - b = - 3 (B)a - b = - 1 (C)a + b = 4 (D)a + b = 5【099年歷屆試題.】
( )28.設直線L:kx + 3y + 10 = 0與圓C:x2 + y2 = 4沒有交點,則常數k的範圍為何? (A) - 4 < k < 4 (B) - 2 < k < 2 (C) (D)或【101年歷屆試題.】
( )29.已知y = 2x的圖形通過圓C:x2 + y2 -