Drag the dots; the angles and lengths formed will be calculated. Turbo mode gives slightly better rendering quality, but it is not necessary.
Changes from @junebeetle's version: *3 angles are calculated *Lengths are calculated *It is now a triangle *If you drag a dot over another dot, they no longer get stuck (now fixed in original) *Rendering issues should be fixed *Added "I've been playing too much KSP" button
