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Perimeter of a right triangle 0

Perimeter of a Right Triangle

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...

Triangle Center 0

Triangle Center

Select your language EnglishSpanish Some classical triangle centers are: Centroid (G) Orthocenter (H) Circumcenter (O) Incenter (I) Centroid of a Triangle The centroid of a triangle (or barycenter of a triangle) G is the...

Altitude of a triangle 0

Altitude of a Triangle

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...

Geometry 0


Select your language EnglishSpanish GEOMETRY What is geometry? Straight line Polygon Triangle Quadrilateral Pentagon Hexagon Heptagon Octagon Conic Section Circle, Semicircle, and Annulus Polyhedron Prism Pyramid Regular polyhedron Surface Area of Revolution Shapes in...

Orthocenter of a triangle 0

Orthocenter of a triangle

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)....

Area of an equilateral triangle 0

Area of an Equilateral Triangle

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...

Heron's Formula 0

Heron’s Formula

Select your language EnglishSpanish Heron’s Formula gives the area of a triangle when we know all three sides. The area is calculated from the semiperimeter of the triangle, s and the length of the...

Arctangent 0


Select your language EnglishSpanish The arctangent (notation: arctan or tan-1) is the inverse function of the tangent. That is: As the arctangent and tangent are inverse functions, their composition is the identity. Thus: Properties...

Cosine 0


Select your language EnglishSpanish In a right triangle, the cosine of an angle θ is defined as the ratio of the adjacent leg (b) to the hypotenuse (c). It is one of the trigonometric...

Secant 0


Select your language EnglishSpanish The secant is the reciprocal trigonometric ratio of the cosine. It is the reciprocal or multiplicative inverse of the cosine, that is, sec θ · cos θ = 1. In a right triangle, the secant...