oikeakulmaisen

Oikeakulmaisen is a Finnish adjective. It translates to "right-angled" in English. This term is primarily used in geometry to describe shapes or figures that contain one or more right angles. A right angle is an angle that measures exactly 90 degrees, forming a perfect square corner.

The most common application of "oikeakulmaisen" is in describing triangles. A triangle with one right angle is called an "oikeakulmainen kolmio" or a right-angled triangle. This type of triangle has specific properties and theorems associated with it, most notably the Pythagorean theorem, which relates the lengths of its sides. The sides of an oikeakulmainen kolmio have distinct names: the two sides forming the right angle are called legs (kateetti), and the side opposite the right angle is called the hypotenuse (hypotenuusa).

Beyond triangles, the term can also be used to describe other geometric shapes. For instance, a rectangle is an "oikeakulmainen nelikulmio," meaning a right-angled quadrilateral, as all its interior angles are right angles. Similarly, a square is also considered an oikeakulmainen nelikulmio. In a broader sense, any line or surface that meets another at a 90-degree angle can be described as being oikeakulmainen relative to the other.