# Tangent Lines to Circles Calc — Tangent Lines & Circle Solver

> Instant tangent line calculator for circles with interactive graphs and step-by-step solutions. (iPhone/iPad app by Heng Jia Liang.)

- Source: https://appshunter.io/ios/app/tangent-lines-to-circles-calc/id1630300212 (this page in markdown: same URL + `.md`)
- Developer: [Heng Jia Liang](https://appshunter.io/developer/1532000635)
- Category: Education, Utilities
- Price: $3.99
- Rating: 3.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English, French (France), German (Germany), Japanese, Korean, Brazilian Portuguese, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan)
- Released: 2022-06-17
- Data updated: 2026-06-04
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/tangent-lines-to-circles-calc/id1630300212/reviews.md

## What is Tangent Lines to Circles Calc?

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.

## Key features

- Three powerful calculation modes
- Live interactive graph visualization
- Full step-by-step solutions
- Cartesian & Polar coordinate support
- High precision calculations
- Slope-intercept and general form equations

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/tangent-lines-to-circles-calc/id1630300212/reviews.md

### 3/5 — Not worth the money

*2023-02-26*

Works fine but is not worth $1.99. No options and very limited. I highly recommend using FSWizard. It is a free machining tool with a full triangle calculator, fillet calculator and more.

## Frequently asked questions about Tangent Lines to Circles Calc

### What types of tangent line problems can TangentCalc solve?

TangentCalc can solve external point tangents, tangent lines by slope, and tangent at a point on the circle. It provides instant computation of tangent points, line equations, and distances.

### Does TangentCalc offer step-by-step solutions?

Yes, TangentCalc provides full, collapsible step-by-step solutions for every calculation, explaining distance formulas, tangent length derivation, and line equation construction.

### Can I use TangentCalc with different coordinate systems?

Yes, TangentCalc supports both Cartesian (x, y) and Polar (r, θ) coordinate input, and allows toggling between Degrees and Radians for angular values.

### How accurate are the calculations in TangentCalc?

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).

### Is TangentCalc suitable for learning geometry?

Yes, the app is designed for students and includes clear step-by-step solutions to help users understand how results are reached, not just to copy answers.

### What devices is TangentCalc available on?

TangentCalc is designed for iOS and works on both iPhone and iPad devices.

### Does TangentCalc have ads?

No, TangentCalc is ad-free. The app offers one download with full access and no advertisements.

### What is the price of TangentCalc?

TangentCalc is a paid app priced at $3.99. It offers full access upon a single download with no subscriptions or in-app purchases.

## Version history (last 3 releases)

### 1.5 — 2026-03-12

- Features and UI updates.

### 1.1 — 2025-07-23

- Updated for the newest devices.
- Minor bugs fixed.

### 1.0 — 2022-06-17

No release notes.

## Apps similar to Tangent Lines to Circles Calc

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Pythagorean Theorem Calc App](https://appshunter.io/ios/app/pythagorean-theorem-calc-app/id1619312460) | — | Free | Education |
| [Abacus - Calc](https://appshunter.io/ios/app/abacus-calc/id6745492769) | — | Free | Education |
| [Mathemagics Geometry in a Dash](https://appshunter.io/ios/app/mathemagics-geometry-in-a-dash/id916829299) | 4.4 (17) | $2.99 | Education |
| [Speed Trigonometry](https://appshunter.io/ios/app/speed-trigonometry/id6747187585) | 5.0 (1) | Free | Education |
| [Geometry Calculator Solver](https://appshunter.io/ios/app/geometry-calculator-solver/id1601846565) | 3.0 (1) | Free | Education |
| [Implicit Differentiation Cal](https://appshunter.io/ios/app/implicit-differentiation-cal/id1607963477) | — | Free | Education |

## More apps by Heng Jia Liang

- [Time Lapse Plus](https://appshunter.io/ios/app/time-lapse-plus/id806506963)
- [Stop Motion Plus](https://appshunter.io/ios/app/stop-motion-plus/id815531972)
- [Bubble Photo Paint](https://appshunter.io/ios/app/bubble-photo-paint/id921345975)
- [Photo Art Painter](https://appshunter.io/ios/app/photo-art-painter/id1037774115)
- [Batch Image Resize](https://appshunter.io/ios/app/batch-image-resize/id1117282560)
- [Dash Cam Plus](https://appshunter.io/ios/app/dash-cam-plus/id1130785852)

All apps by Heng Jia Liang: https://appshunter.io/developer/1532000635

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-04.*