Coordinate Geometry PYQ — Page 11

A straight line cuts off the intercepts $\mathrm{OA}=\mathrm{a}$ and $\mathrm{OB}=\mathrm{b}$ on the positive directions of $\mathrm{x}$-axis and $\mathrm{y}-$ axis respectively. If the perpendicular from origin $\mathrm{O}$ to this line makes an angle of $\frac{\pi}{6}$ with positive direction of $y$-axis and the area of $\triangle \mathrm{OAB}$ is $\frac{98}{3} \sqrt{3}$, then $\mathrm{a}^2-\mathrm{b}^2$ is equal to:

Let $A$ be the point $(1,2)$ and $B$ be any point on the curve ${x}^{2}+{y}^{2}=16$. If the centre of the locus of the point $P$, which divides the line segment $AB$ in the ratio $3:2$ is the point $C(\alpha ,\beta )$, then the length of the line segment $AC$ is

The set of all values of ${a}^{2}$ for which the line $x+y=0$ bisects two distinct chords drawn from a point $P(\frac{1+a}{2},\frac{1-a}{2})$ on the circle $2{x}^{2}+2{y}^{2}-(1+a)x-(1-a)y=0$, is equal to :

Let $y=x+2,4y=3x+6$ and $3y=4x+1$ be three tangent lines to the circle $(x-h{)}^{2}+(y-k{)}^{2}={r}^{2}$. Then $h+k$ is equal to :

A circle passing through the point $P(\alpha ,\beta )$ in the first quadrant touches the two coordinate axes at the points $A$ and $B.$ The point $P$ is above the line $AB.$ The point $Q$ on the line segment $AB$ is the foot of perpendicular from $P$ on $AB.$ If $PQ$ is equal to $11$ units, then the value of $\alpha \beta$ is $_______$

The parabolas : $a{x}^{2}+2bx+cy=0$ and ${d}^{2}+2ex+fy=0$ intersect on the line $y=1$. If $a,b,c,d,e,f$ are positive real numbers and $a,b,c$ are in $G.P.$, then

If the $x$-intercept of a focal chord of the parabola ${y}^{2}=8x+4y+4$ is $3$, then the length of this chord is equal to _____ .

Let an ellipse with centre $(1,0)$ and latus rectum of length $\frac{1}{2}$ have its major axis along x-axis. If its minor axis subtends an angle ${60}^{\circ }$ at the foci, then the square of the sum of the lengths of its minor and major axes is equal to _______.

Let $P(\frac{2\sqrt{3}}{\sqrt{7}},\frac{6}{\sqrt{7}}),Q,R$ and $S$ be four points on the ellipse $9{x}^{2}+4{y}^{2}=36$. Let $PQ$ and $RS$ be mutually perpendicular and pass through the origin. If $\frac{1}{{(PQ)}^{2}}+\frac{1}{{(RS)}^{2}}=\frac{p}{q},$ where $p$ and $q$ are coprime, then $p+q$ is equal to

The distance between the foci of the hyperbola x²/9 - y²/16 = 1 is:

Let $H$ be the hyperbola, whose foci are $(1\pm \sqrt{2},0)$ and eccentricity is $\sqrt{2}$. Then the length of its latus rectum is:

Two circles in the first quadrant of radii ${r}_{1}$ and ${r}_{2}$ touch the coordinate axes. Each of them cuts off an intercept of $2$ units with the line $x+y=2$. Then ${{r}_{1}}^{2}+{{r}_{2}}^{2}-{r}_{1}{r}_{2}$ is equal to ____.

Let $PQ$ be a focal chord of the parabola ${y}^{2}=36x$ of length $100,$ making an acute angle with the positive $x-$axis. Let the ordinate of $P$ be positive and $M$ be the point on the line segment $PQ$ such that $PM:MQ=3:1.$ Then which of the following points does $\mathrm{NOT}$ lie on the line passing through M and perpendicular to the line $PQ$?

The points of intersection of the line $ax+by=0$, $(a\neq b)$ and the circle ${x}^{2}+{y}^{2}-2x=0$ are $A(\alpha ,0)$ and $B(1,\beta )$. The image of the circle with $AB$ as a diameter in the line $x+y+2=0$ is :

If the orthocentre of the triangle, whose vertices are $(1,2),(2,3)$ and $(3,1)$ is $(\alpha ,\beta )$, then the quadratic equation whose roots are $\alpha +4\beta$ and $4\alpha +\beta$, is

The locus of the middle points of the chords of the circle ${C}_{1}:{(x-4)}^{2}+{(y-5)}^{2}=4$ which subtend an angle ${\theta }_{i}$ at the centre of the circle ${C}_{i}$, is a circle of radius ${r}_{i}$. If ${\theta }_{1}=\frac{\pi }{3}$, ${\theta }_{3}=\frac{2\pi }{3}$ and ${{r}_{1}}^{2}={{r}_{2}}^{2}+{{r}_{3}}^{2}$, then ${\theta }_{2}$ is equal to

Let $B$ and $C$ be the two points on the line $y+x=0$ such that $B$ and $C$ are symmetric with respect to the origin. Suppose $A$ is a point on $y-2x=2$ such that $\Delta ABC$ is an equilateral triangle. Then, the area of the $\Delta ABC$ is

The equations of the sides $AB,BC&CA$ of a triangle $ABC$ are $2x+y=0$, $x+py=21a$ $(a\neq 0)$ and $x-y=3$ respectively. Let $P(2,a)$ be the centroid of the triangle $ABC$, then ${(BC)}^{2}$ is equal to

Points $P(-3,2),Q(9,10)$ and $R(\alpha ,4)$ lie on a circle $C$ with $PR$ as its diameter. The tangents to $C$ at the points $Q$ and $R$ intersect at the point $S$. If $S$ lies on the line $2x-ky=1$, then $k$ is equal to _____ .

The number of common tangents, to the circles ${x}^{2}+{y}^{2}-18x-15y+131=0$ and ${x}^{2}+{y}^{2}-6x-6y-7=0$, is

Let the eccentricity of an ellipse $\frac{{x}^{2}}{{a}^{2}}+\frac{{y}^{2}}{{b}^{2}}=1$ is reciprocal to that of the hyperbola $2{x}^{2}-2{y}^{2}=1$. If the ellipse intersects the hyperbola at right angles, then square of length of the latus-rectum of the ellipse is _____.

A triangle is formed by $X$-axis, $Y$-axis and the line $3x+4y=60$. Then the number of points $P(a,b)$ which lie strictly inside the triangle, where $a$ is an integer and $b$ is a multiple of $a$, is _____ .

Let the point $(p,p+1)$ lie inside the region $E={(x,y):3-x\leq y\leq \sqrt{9-{x}^{2}},0\leq x\leq 3}.$ If the set of all values of $p$ is the interval $(a,b),$ then ${b}^{2}+b-{a}^{2}$ is equal to $________.$

If $(\alpha ,\beta )$ is the orthocenter of the triangle $ABC$ with vertices $A(3,–7),B(–1,2)$ and $C(4,5)$, then $9\alpha -6\beta +60$ is equal to