Graph & Geometry

Plot y = f(x), polar, parametric and implicit graphs with sliders, find zeros and crossings, and draw points, segments, circles and angles. Free, private, runs in your browser.

How it works

  1. Type a formula such as y = x^2 - 4 or r = 2 + cos(theta). A new letter like a becomes a slider.
  2. Drag or pinch to move and zoom. Zeros and the points where graphs meet are marked.
  3. Switch to Point, Segment, Circle or Angle to draw geometry, then download a PNG or copy a share link.

Questions

Which graphs can I plot?

y = f(x), vertical lines x = c, polar r = f(theta), parametric x = f(t), y = g(t), and implicit curves such as x^2 + y^2 = 9.

How do sliders work?

Any letter other than x, y, t and theta that you use in a formula gets a slider. You can also write a = 3 on its own line.

What does the share link contain?

Only the formulas, never your points. Anyone who opens the link can read them, and the graph opens already drawn.