täisnurksed

Täisnurksed is the Estonian word for right-angled. It is primarily used in geometry to describe shapes or angles that have a right angle. A right angle measures exactly 90 degrees.

In geometry, a täisnurkne kolmnurk is a right-angled triangle. This is a triangle that contains one angle measuring 90 degrees. The sides that form the right angle are called the legs, and the side opposite the right angle is called the hypotenuse. The Pythagorean theorem, a² + b² = c², applies specifically to täisnurksed kolmnurgad, where 'a' and 'b' are the lengths of the legs and 'c' is the length of the hypotenuse.

A täisnurkne hulknurk is a polygon with at least one right angle. For example, a täisnurkne nelinurk is a rectangle, which has four right angles. A ruut, or square, is also a täisnurkne nelinurk, possessing four equal sides and four right angles.

The concept of täisnurksed is fundamental in Euclidean geometry and is used in various fields, including architecture, engineering, and surveying, where precise angles are crucial for construction and measurement. Understanding täisnurksed shapes and their properties allows for accurate calculations and the creation of stable and functional structures.