External Triangle

This application is a Triangle calculator. (From some known value input, it calculates other value.)
For both educational purpose and practical purpose like design, it equips the below functions that were not available in existing similar software.
* Calculation parameter expansion like area,coordinates, etc., and calculation combinations expansion.
* Length and area fields equip input and calculation result with fraction, square root, number with π, or yard/feet/inch.
* Angle field equips input and calculation result with Deg/Min/Sec or radian(number with π).

It equips User Interface suitable for Touchscreen. (Direct touch to displayed number works as number input or modification, or switching between result and input.)

(Spec)
・Triangle calculation sheets. One triangle parameters are divided into 3 sheets.
・Circle sheet and simple total sheet (2 items total) are equipped as auxiliary.
・Number input and modification by direct touch action to the digit you want to change. In re-calculation of slight changes, entering full number is not necessary.
・Number input in keyboard sheet with keys that according to the number type to input.
・The direction of calculation is switchable by touch. Inverse calculation, changing result field to input, is easy.
・Calculation result is automatically done at the time necessary inputs reach.
・At the pressed moment of the key, the key function is shown display. (Not the released moment.)
・Lock of each number is possible.
・Internal calculation: 16-digit decimal or fraction or number with square root, independently developed (Not binary floating/double)
・Display number length is selected from 10/14-digit depending on screen size. (This digit becomes fewer when the number includes units.)
・2 sheets can be parallelly shown and operated if screen size is larger.
・Copy / paste function of a each number and a sheet.
・1 memory
・Triangle outline shape display sheet
・Configurable rounding location classified 3 kinds, length/area/angle.
・Selectable angle unit 4 types. DegMinSec/Degree/Radian/Gradian.
・Selectable decimal point/separator character(5) and separator position(4), and number character(19).
・Automatic save of the calculation state at the application termination.
・Whole initializing. Or returning to the state at the time application started.
・Dark theme(Android10)