Enter values for any 2 known sides (Green + Yellow) or any 1 side and 1 angle. Hit Calculate to calculate all other sides and angles and re-draw the Right Triangle.
Only 2 entries will be active at any time. One green, the other yellow. All other sides and angles are calculated from the current 2 active entries.
Click any side or angle entry to activate it and add or edit its value. The side or angle input background will change to indicate active and non active entries and the formulas at right will change to reflect the current active selection of known sides / angles.
Mouse over the Animate arrows 
 to increment or decrement the current green active side or angle to re-calculate and re-draw the right triangle repeatedly.
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