100% Free (*scroll to details below)
The best triangle calculator.
Great for students, teachers, carpenters, navigators, orienteers, surveyors, astronomers,... or anyone that uses triangle geometry.
The only triangle solver that draws the values you enter and enters the values you draw.
Enter what you know, whatever you know, and the app dynamically tells you everything that can be calculated from even partial information. If any value is possible to solve, Trisolve immediately solves it. If it is impossible to solve, Trisolve 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.
Trisolve solves triangles using sides and angles, xy, or rΘ coordinate systems, or any combination of each that suit your situation.
Calculates sides, angles, heights, perimeter, area, vertex positions and multiple centers. Trisolve also allows you to enter sides, angles, heights, perimeter, area, vertex positions and multiple 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, and much much more. Unit conversions are easy, just choose the units and Trisolve converts automatically without reentry.
Transformations include translate, rotate, reflect and dilate. Transformations are adjusted based on the coordinate system to facilitate easy understanding by students while giving maximum flexiblity for advanced users.
Calculates results 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, Trisolve handles these cases with precision.
All values can be both user entered or calculated in any combination. For example, enter the triangle base and height and area is calculated. Enter area and height and the triangle base is calculated. Enter any value in any order and the correct formula is applied forwards and backwards, regardless of what you enter. No other app comes close to this feature.
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.
Inputs can be cleared and restored individually by clicking the associated value's icon for experimental adjustments.
Field sizes are dynamically adjusted based on the user's entered information so extreme precision values fit on the smallest phone screens.
Trisolve is the best triangle solver on Google Play, free or paid, period.
* Free Limited Time Offer:
Own Trisolve by contacting the developer by email and requesting a free promotional code. This offer is for a 100% fully functional download, no ads, no upsells, no in-app purchases, no strings,... just free. Trisolve is also available for free 1 week every 30 days directly from Google Play.
Developer's email: bessermt@gmail.com
Sorry, but lawyers made me say this... Use of Trisolve is solely at your own risk.