100% Free (*scroll to details below)

The best triangle calculator.

Great for geometry students, teachers, carpenters, navigators, orienteers, surveyors, astronomers,... or anyone wanting to solve triangles.

The only triangle calculator that draws the values you enter and enters the values you draw.

Enter anything you know and the app dynamically tells you everything that can be calculated, including inverse calculations. If any value is possible to solve, the app solves it. If a value is impossible to solve, the app lets you know that too.

No need to press an enter key to solve your triangle. Just draw or enter and immediately visualize the solution.

Easily clear and restore individual values by touching the value's icon. Press and hold an angle icon for quick right triangle entry.

Trisolve calculates triangles using sides and angles, xy, or rθ coordinate systems, including any combination of each to suit your situation.

Solves sides, angles, heights, perimeter, area, vertex positions and multiple centers. Trisolve also allows you to enter heights, perimeter, area, vertex positions and centers, not just sides and angles like other triangle solvers.

Categorize scalene, isosceles and equilateral as well as acute, right, and obtuse triangles. Identifies and solves ambiguous triangles.

Angle measures for degrees, radians, grads, deg min sec, % grades, .... Unit conversions are easy, just choose the units and Trisolve converts automatically without reentry.

Transformations include translate, rotate, reflect and dilate. Transformations are coordinate system based to facilitate easy understanding by students while giving maximum flexibility for advanced users.

Results are calculated using numerically stable trigonometric algorithms giving the most precise results possible even in extreme engineering applications. Unlike many triangle solvers that give wrong answers under extreme conditions, these cases are handled with precision.

All values can be either user entered or app calculated in any combination. Enter the triangle's base and height and area is calculated. You can also enter the triangle's area and height and the base is calculated. Enter any value in any order and the correct formula is applied. No other app calculates geometric inverse functions and partial solutions like this app does.

Calculable values are shown with easily identifiable color icons while user entered values are indicated by high contrast monochrome icons suitable for color blind users.

Both inputs and outputs can be modified to allow for exploration and experimentation.

Field sizes are dynamically adjusted based on the user's entered information so extreme precision values fit on the smallest phone screens.

You have found the best triangle solver, no risk, 100% guaranteed.

* Free Limited Time Offer:

Contact the developer by email and request a free promotional code. This offer is for a fully functional download, no ads, no upsells, no in-app purchases, no kidding,... just free.

Developer's email: [email protected]