Doubtclip is an AI tutor that turns any homework or exam doubt into a step-by-step whiteboard video lesson with diagrams, formulas, and voice explanation.

Which subjects and exams does it support?

It supports Physics, Chemistry, Mathematics/Calculus and related STEM doubts for school boards, JEE, NEET, and global high-school / undergrad practice.

How do I get a video solution?

Upload a photo of the question or paste the text, sign in, and Doubtclip generates a whiteboard-style explanation video you can watch and share.

Is Doubtclip available worldwide?

Yes. Doubtclip is a web app for students globally. Lessons are available in English and Hinglish.

Coordinate Geometry

JEE Main level, numerical answer, medium

3 of 5

Question 3 of 5

The radius of the circle given by equation $x^2 + y^2 - 6x + 8y = 0$ is:

Show answer and solution

Answer: 5

2g = -6 \implies g = -3

2f = 8 \implies f = 4

c = 0

. Radius

r = \sqrt{g^2 + f^2 - c} = \sqrt{9 + 16} = \sqrt{25} = 5

JEE Main question paper PDF

Open a shift to read the full paper on this page, or download it.

JEE Main 2025 Apr 2 Shift 1 question paper

Open Download PDF

Opening paper…

Explain it as a whiteboard videoStep-by-step, in Hinglish or English. Your first video needs no login.Solved it on paper but got it wrong?Upload a photo of your working. Mistake Doctor marks the exact line that broke.

More Mathematics practice

Coordinate GeometryThe equation of the tangent to the parabola $y^2 = 8x$ with slope $m = 2$ is:
Coordinate GeometryIf the latus rectum of an ellipse $\frac{x^2}{a^2} + \frac{y^2}{b^2} = 1$ is half of its minor axis, the eccentricity $e$ is:
Coordinate GeometryIf a straight line has slope $m_1 = -0.25$ , then the slope of the line perpendicular to it is:
Coordinate GeometryLength of latus rectum of an ellipse $\frac{x^2}{a^2}+\frac{y^2}{b^2}=1$ is one-third of its major axis. Its eccentricity $e$ is:
Integral CalculusThe area (in sq. units) bounded by the parabola $y = x^2$ and the straight line $y = 2x$ is:
Matrices & DeterminantsIf the matrix $A = \begin{pmatrix} 2 & k \\ 4 & 6 \end{pmatrix}$ is singular, then the value of $k$ is:

JEE Main Mathematics practice question on Coordinate Geometry, with the answer and a step-by-step solution. Scan a question from your own book or paper to get a whiteboard video.

The radius of the circle given by equation x2+y2−6x+8y=0x^2 + y^2 - 6x + 8y = 0x2+y2−6x+8y=0 is:

JEE Main question paper PDF

More Mathematics practice

The radius of the circle given by equation $x^2 + y^2 - 6x + 8y = 0$ is: