Home
Class 12
MATHS
STATEMENT-1 : The area of equilateral tr...

STATEMENT-1 : The area of equilateral triangle inscribed in the circle `x^(2) + y^(2) + 6x + 8y + 24 = 0` is `(3sqrt(3))/(4)`.
STATEMENT-2 : The abscissae of two points A and B are the roots of the equation `x^(2) + 3ax + b^(2) =0` and their ordinates are the roots of `x^(2) + 3bx + a^(2) =0` Then the equation of the circle with AB as diameter is `x^(2) + y^(2) + 3ax + 3by + a^(2) + b^(2) = 0`.
STATEMENT-3 : If the circle `x^(2) + y^(2) + 2gx + 2fx +c =0` always passes through exactly three quadrants not passing through origin then `c gt 0`.

A

T F T

B

T T T

C

F F F

D

F F T

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question step by step, we will analyze each statement one by one. ### Statement 1: **The area of the equilateral triangle inscribed in the circle \( x^2 + y^2 + 6x + 8y + 24 = 0 \) is \( \frac{3\sqrt{3}}{4} \).** 1. **Convert the circle equation to standard form:** \[ x^2 + y^2 + 6x + 8y + 24 = 0 \] Completing the square for \( x \) and \( y \): \[ (x^2 + 6x) + (y^2 + 8y) + 24 = 0 \] \[ (x + 3)^2 - 9 + (y + 4)^2 - 16 + 24 = 0 \] \[ (x + 3)^2 + (y + 4)^2 = 1 \] Thus, the center of the circle is \( (-3, -4) \) and the radius \( r = 1 \). 2. **Area of the equilateral triangle inscribed in the circle:** The area \( A \) of an equilateral triangle inscribed in a circle of radius \( r \) is given by: \[ A = \frac{3\sqrt{3}}{4} r^2 \] Substituting \( r = 1 \): \[ A = \frac{3\sqrt{3}}{4} \cdot 1^2 = \frac{3\sqrt{3}}{4} \] Therefore, Statement 1 is **True**. ### Statement 2: **The abscissae of two points A and B are the roots of the equation \( x^2 + 3ax + b^2 = 0 \) and their ordinates are the roots of \( x^2 + 3bx + a^2 = 0 \). The equation of the circle with AB as diameter is \( x^2 + y^2 + 3ax + 3by + a^2 + b^2 = 0 \).** 1. **Let the roots of the first equation be \( x_1 \) and \( x_2 \):** - Sum of roots \( x_1 + x_2 = -3a \) - Product of roots \( x_1 x_2 = b^2 \) 2. **Let the roots of the second equation be \( y_1 \) and \( y_2 \):** - Sum of roots \( y_1 + y_2 = -3b \) - Product of roots \( y_1 y_2 = a^2 \) 3. **Equation of the circle with AB as diameter:** The equation of a circle with diameter endpoints \( (x_1, y_1) \) and \( (x_2, y_2) \) is: \[ \left(x - \frac{x_1 + x_2}{2}\right)^2 + \left(y - \frac{y_1 + y_2}{2}\right)^2 = \left(\frac{x_2 - x_1}{2}\right)^2 + \left(\frac{y_2 - y_1}{2}\right)^2 \] Expanding this gives: \[ x^2 + y^2 + 3ax + 3by + a^2 + b^2 = 0 \] Therefore, Statement 2 is **True**. ### Statement 3: **If the circle \( x^2 + y^2 + 2gx + 2fy + c = 0 \) always passes through exactly three quadrants not passing through the origin, then \( c > 0 \).** 1. **Analyzing the condition:** - The circle passes through three quadrants, which implies it must be positioned such that it does not intersect the x-axis and y-axis in the fourth quadrant. - The center of the circle is \( (-g, -f) \). 2. **Condition for the circle to not pass through the origin:** - Substituting \( (0, 0) \) into the circle's equation gives \( c > 0 \). 3. **Conclusion:** - If \( c > 0 \), then the circle will not pass through the origin and can be positioned to pass through three quadrants. Therefore, Statement 3 is **True**. ### Final Conclusion: All three statements are true.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • CONIC SECTIONS

    AAKASH INSTITUTE ENGLISH|Exercise SECTION -I ( Subjective Type Questions )|24 Videos
  • CONIC SECTIONS

    AAKASH INSTITUTE ENGLISH|Exercise SECTION - J ( Aakash Challengers Questions )|16 Videos
  • CONIC SECTIONS

    AAKASH INSTITUTE ENGLISH|Exercise SECTION-G ( Integer Answer Type Questions )|12 Videos
  • COMPLEX NUMBERS AND QUADRATIC EQUATIONS

    AAKASH INSTITUTE ENGLISH|Exercise section-J (Aakash Challengers Qestions)|13 Videos
  • CONTINUITY AND DIFFERENTIABILITY

    AAKASH INSTITUTE ENGLISH|Exercise section - J|6 Videos

Similar Questions

Explore conceptually related problems

The abscisae of A and B are the roots of the equation x ^(2) + 2ax -b ^(2) =0 and their ordinates are the roots of the equation y ^(2) + 2 py -q ^(2) =0. The equation of the circle with AB as diameter is

The abscissa of A and B are the roots of the equation x^(2) + 2ax -b^(2) =0 and their ordinates are the roots of the equation y^(2) + 2py -q^(2) = 0. The equation of the circle with AB as diameter is

Area of the equilateral triangle inscribed in the circle x^(2) + y^(2) - 7x + 9y + 5 = 0 , is …………

The area of an equilateral triangle inscribed in the circle x^(2)+y^(2)+2gx+2fy+c=0 is

The abscissa of the two points A and B are the roots of the equation x^2+2a x-b^2=0 and their ordinates are the roots of the equation x^2+2p x-q^2=0. Find the equation of the circle with AB as diameter. Also, find its radius.

The abscissa of the two points A and B are the roots of the equation x^2+2a x-b^2=0 and their ordinates are the roots of the equation x^2+2p x-q^2=0. Find the equation of the circle with AB as diameter. Also, find its radius.

Find the area of equilateral triangle inscribed in a circle x^2+y^2+2gx+2fy+c=0

If the abscissae of points A, B are the roots of the equation, x^(2) + 2ax - b^(2) = 0 and ordinates of A, B are roots of y^(2)+2py- q^(2) = 0 , then find the equation of a circle for which overline(AB) is a diameter.

If an equilateral triangle is inscribed in the circle x^(2)+y^(2)-6x-4y+5=0 then its side is

The roots of the equation x^(2)-2sqrt(3)x+3=0 are