- A right-angled triangle is formed by perpendicular legs and a hypotenuse — the longest edge.
- The sum of angles in the triangle is 180°, with α + β = 90°.
- Edge lengths can be determined using the Pythagoras theorem, angle sizes using the trigonometric functions.

- P – perimeter
- A – area

- a,b – right-angled legs
- c – hypotenuse

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