tasakylkisiä

Tasakylkisiä is a Finnish term referring to an isosceles triangle. An isosceles triangle is a triangle that has at least two sides of equal length. These two equal sides are called legs, and the third side is called the base. The angles opposite the equal sides are also equal. The angle between the two equal sides is known as the vertex angle, and the two equal angles opposite the legs are called base angles. In Euclidean geometry, the sum of the interior angles of any triangle, including an isosceles triangle, is always 180 degrees. The properties of isosceles triangles are fundamental in geometry and are often used in proofs and problem-solving. For example, if a line segment is drawn from the vertex angle perpendicular to the base, it bisects both the vertex angle and the base, and it is also the altitude and the median to the base. This geometric property is a key characteristic of isosceles triangles. The term "tasakylkisiä" directly translates to "equal-sided" in a way that implies two sides are equal, distinguishing it from equilateral triangles which have all three sides equal.