täisnurga

Täisnurk is the Estonian word for a right angle. A right angle is a fundamental concept in geometry, typically formed by two perpendicular lines or rays. It is an angle that measures exactly 90 degrees, or pi/2 radians. In Euclidean geometry, a right angle is often depicted as an L-shape.

The concept of a right angle is crucial in various mathematical and scientific fields. For instance, in trigonometry, the sine, cosine, and tangent of angles are defined using right triangles. In coordinate geometry, the x and y axes are perpendicular, forming right angles at their intersection point, the origin. Many geometric shapes are defined by their angles, and the presence of right angles is a defining characteristic of rectangles, squares, and trapezoids.

Architects and builders rely heavily on the concept of right angles to ensure structures are stable and walls are perpendicular to the floor. Carpenters use tools like T-squares and combination squares to measure and mark right angles. In everyday life, we encounter right angles in the corners of rooms, books, and many man-made objects. The word "täisnurk" directly translates to "full angle" or "complete angle" in a way that distinguishes it from other angles, emphasizing its distinct and complete 90-degree measure.