
Tangent Lines to Circles Calc
Tangent Lines & Circle Solver
$3.99 · Designed for iPad
Solve tangent line problems instantly. Live graph, step-by-step solutions, polar & Cartesian modes. The geometry calculator students actually need.
The most powerful tangent line calculator for circles — built for students, engineers, and geometry enthusiasts.
TangentCalc solves every type of tangent line problem instantly, with a live interactive graph and full step-by-step solutions. Whether you're solving analytic geometry homework, checking exam answers, or exploring coordinate geometry, TangentCalc gives you precise results in seconds.
* THREE POWERFUL CALCULATION MODES
External Point Tangents
Enter any external point and circle — TangentCalc instantly computes both tangent points, both tangent line equations, the exact distance from point to center, and the tangent length. Every step is explained clearly so you can learn, not just copy answers.
Tangent Lines by Slope
Input any slope value and circle, and get the two parallel tangent lines that touch the circle at that angle. Perfect for analytic geometry problems where the line direction is given instead of a point.
Tangent at a Point on the Circle
Already know where the tangent touches the circle? Enter the point and get the exact tangent line equation immediately. Includes a smart "Snap to Circle" button that auto-projects any nearby point onto the circle for you.
* LIVE INTERACTIVE GRAPH
See your geometry come to life with a real-time visualization canvas:
Pinch to zoom in and out freely
Drag to pan across the coordinate plane
Graph updates live as you type new values
Tangent lines, tangent points, radii, and external points all displayed with color-coded clarity
Resizable graph panel to suit your screen
* STEP-BY-STEP SOLUTIONS
TangentCalc doesn't just give you answers — it teaches you the math. Every calculation comes with a full, collapsible step-by-step solution showing:
Distance formulas
Tangent length derivation
Tangent point coordinates
Line equation construction
Circle-form tangent formula
Ideal for checking your own working or understanding how each result was reached.
* CARTESIAN & POLAR COORDINATE SUPPORT
Switch seamlessly between Cartesian (x, y) and Polar (r, θ) coordinate input. Toggle between Degrees and Radians for angular values. Cartesian equivalents are shown in real time when using polar mode so there's no confusion.
* BUILT FOR ACCURACY
All results are computed to 6 decimal places of precision. Equations are displayed in both slope-intercept form (y = mx + b) and general form (ax + by + c = 0). Selectable result text lets you copy values directly into your notes or assignments.
* PERFECT FOR:
High school and university geometry students
Analytic geometry and calculus coursework
Engineering and physics problem sets
Teachers demonstrating tangent line concepts
Anyone who needs fast, accurate circle-tangent calculations
* DESIGNED FOR iOS
Clean dark interface designed for focus. Monospaced math typography for clarity. Works on iPhone and iPad. No ads. No subscriptions. One download, full access.
Download TangentCalc and solve tangent line problems the smart way.
Thanks for your support, and do visit nitrio.com for more apps for your iOS devices.
- Features and UI updates.
The developer, Heng Jia Liang, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Heng Jia Liang
- Size
- 839.7 KB
- Category
- Education
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- Languages
English and 8 more
- English, French, German, Japanese, Korean, Portuguese, Simplified Chinese, Spanish, Traditional Chinese
- Age Rating
4+
- 4+
- Copyright
- © Heng Jia Liang
