Epäsuorakulmaisten

Epäsuorakulmaisten is a Finnish term that translates to "non-right-angled" or "oblique" in English. It is typically used in geometry to describe shapes or angles that do not possess right angles. A right angle is an angle measuring exactly 90 degrees, forming a perfect square corner.

In the context of polygons, an epäsuorakulmainen quadrilateral, for instance, would be any four-sided figure that does not have all its interior angles equal to 90 degrees. This includes parallelograms, rhombuses, trapezoids, and general irregular quadrilaterals. Conversely, a rectangle or a square would be examples of suorakulmainen (right-angled) quadrilaterals.

Similarly, in trigonometry and surveying, the term might refer to an epäsuorakulmainen kolmio, or a non-right-angled triangle. This encompasses any triangle where none of the three interior angles is 90 degrees. All triangles are either acute (all angles less than 90 degrees), obtuse (one angle greater than 90 degrees), or right-angled (one angle exactly 90 degrees). Therefore, an epäsuorakulmainen triangle would be either an acute or an obtuse triangle.

The concept of epäsuorakulmainen highlights the absence of the specific geometric property of a right angle, differentiating such shapes or angles from their right-angled counterparts.