Select your language EnglishSpanish In a triangle ABC the orthocenter H is the intersection point of the three altitudes of the triangle. Every triangle has three altitudes (or heights) and three sides (or bases)....

Select your language EnglishSpanish The isosceles triangle is a polygon of three sides with two equal sides. The other side unequal is called the base of the triangle. Therefore, the angles will also be...

Select your language EnglishSpanish An equilateral triangle has three equal sides and angles. As in any type of triangle, its area is equal to half of the product of its base and height. So...

Select your language EnglishSpanish Every triangle has lines (also called cevians) and points that determine a number of important elements. There are many different constructions that find a special point associated with a triangle,...

Select your language EnglishSpanish In a right triangle, different elements can be distinguished, referring to its sides and angles. Legs (or cathetus): are the sides of the triangle that together form the right angle....

Select your language EnglishSpanish In any non-equilateral triangle the orthocenter (H), the centroid (G) and the circumcenter (O) are aligned. The line that contains these three points is called the Euler line. In an...

Select your language EnglishSpanish The perimeter of a right triangle is the sum of the lengths of the two legs and the hypotenuse (in other words, the sum of all three sides). Download this...

Select your language EnglishSpanish The altitude of a triangle, or height, is a line from a vertex to the opposite side, that is perpendicular to that side. It can also be understood as the...

Select your language EnglishSpanish The legs (or catheti; singular: cathetus) are the sides in a right triangle that form its right angle (90°). The side opposite the right angle is called the hypotenuse. The...