Let $PQ: 2x+y+6=0$ is a chord of the curve $x^2 – 4 y^2 = 4$. Coordinates of the point $R(\alpha,\beta)$ that satisfy $\alpha^2+\beta^2-1 \leq 0$, such that area of triangle $PQR$ is minimum ; are given by :
I have tried finding out the points of contact of the hyperbola but for the given equations the points are lengthy to find.
I have also considered drawing a line segment perpendicular to point P to the circle where there which can give minimum area of the triangle
This is a JEE Problem (High-school Level) Where we get 3 Minutes time to solve. Any easily approachable Answer is much appreciated.
Best Answer
Hint1: All the different triangles have the same base. So the one with the least area has the least height.
Hint2: Find the normal of the circle whose slope is perpendicular to the line
Note that you don't have to find $P,Q$
Graph for reference