Oikeakulmaisissa

Oikeakulmaisissa is a Finnish term that translates to "right-angled" or "perpendicular" in English. It is primarily used in geometry to describe shapes or lines that form a right angle, which is an angle measuring exactly 90 degrees.

In the context of shapes, oikeakulmaisissa often refers to quadrilaterals. A rectangle, for instance, is a shape with four sides and four right angles. Similarly, a square is a special type of rectangle where all four sides are of equal length, and it also possesses four right angles. Triangles can also be classified as oikeakulmaisissa if one of their internal angles is a right angle. Such a triangle is known as a right-angled triangle.

The concept of oikeakulmaisissa is fundamental in Euclidean geometry. It is used in various mathematical concepts and theorems, including the Pythagorean theorem, which specifically applies to right-angled triangles. The axes of a coordinate system are also depicted as oikeakulmaisissa, intersecting each other at a right angle at the origin. This perpendicularity allows for the precise location of points in a two-dimensional or three-dimensional space. The term is a direct and descriptive way to convey the geometric property of forming a 90-degree angle.