The circle C1:x2+y2=3, with centre at O, intersects the parabola x2=2y at the point P in the first quadrant. Let the tangent to the circle C1 at P touch other two circles C2 and C3 at R2 and R3, respectively. Suppose C2 and C3 have equal radii 2⋅3 and centres Q2 and Q3, respectively. If Q2 and Q3 lie on the y-axis, then (1)Q2Q3=12(2)R2R3=4⋅6(3) area of the triangle OR2R3 is 6⋅2(4) area of the triangle PQ2Q3 is 4⋅2
Answers:A. Q2Q3=12 · B. R2R3=46 · C. area of the triangle OR2R3 is 62
The circle C₁ : x² + y² = 3, with centre at O, intersects the parabola x² = 2y at the point P in the first quadrant. Let the tangent to the circle C₁, at P touches other two circles C₂ and C₃ at R₂ and R₃, respectively. Suppose C₂ and C₃ have equal radii 2√{3} and centres Q₂ and Q₃, respectively. If Q₂ and Q₃ lie on the y-axis, then
C1:x2+y2=3(centre O),parabola x2=2yP=C1∩(x2=2y), in the first quadrantC2,C3: radius 23,centres Q2,Q3 on the y-axisWhich of the statements (1)-(4) are correct?1.P=C1∩(x2=2y); tangent at P2.Qi=(0,q): distance from Qi to tangent=233.find R2,R3, then test (1)-(4)x2+(2x2)2=3⇒x4+4x2−12=0(x2+6)(x2−2)=0⇒x2=2⇒P(2,1)2x+y=3(tangent at P)Qi=(0,q):3∣q−3∣=23⇒∣q−3∣=6q=9 or q=−3⇒Q2(0,9),Q3(0,−3)Ri=Qi−3(qi−3)(2,1)R2(−22,7),R3(22,−1)Q2Q3=∣9−(−3)∣=12✓ (1) is correctR2R3=(42)2+(−8)2=96=46✓ (2) is correct[△OR2R3]=21(−22)(−1)−(7)(22)=62✓ (3) correct[△PQ2Q3]=21⋅12⋅2=62=42✗ (4) is falseCorrect statements: (1), (2), (3)