📐 Geometry
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- ▶Right-triangle area
- 🔒Rectangle perimeter
- 🔒Missing triangle angle
- 🔒Pythagorean hypotenuse
- 🔒Pythagorean leg
- 🔒Triangle area (Heron)
- 🔒Trapezoid area
- 🔒Regular polygon angle
- 🔒Isosceles apex angle
- 🔒Isosceles exterior angle
- 🔒Cyclic quadrilateral
- 🔒Angle between parallels
- 🔒Inscribed & central angle
- 🔒Double isosceles chase
- 🔒Star point angles
- 🔒Two tangents to a circle
- 🔒Incentre angle (BIC)
- 🔒Orthocentre angle (BHC)
- 🔒Circumcentre angle (BOC)
- 🔒Angle bisector foot
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