Home › AP EAPCET (Engineering) › Mathematics › Coordinate Geometry: Parabola › In the pin and string construction, the free edg…
In the pin and string construction, the free edge of the set square slides along the
Aaxis of symmetry
Blatus rectum
Cvertex tangent
Ddirectrix line
Answer & Solution
Correct answer: D. directrix line
The string keeps the pen equally far from the focus and the directrix, so the sliding edge must run along the directrix.
Related questions
A point of y² = 4x is 5 units from the focus. What is its x-coordinate?A point moves so that its distance from (3, 0) equals its distance from x = -3. Find its lA lamp is placed at the focus of a parabolic reflector. The reflected beam isWhich device uses a parabolic reflector to send out a parallel beam?How far is the focus of y² = 24x from its directrix?What is the tangent at the vertex of y² = 4ax?The line y = x cuts a chord on y² = 4x. What is the chord length?Apart from the origin, where does y = x meet y² = 4x?