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Double-Angle Formulas 0

Trigonometry

Double-Angle Formulas

Select your language EnglishSpanish Let α be an angle. The double-angle (2α) trigonometric ratios can be expressed as a function of the trigonometric ratios of the angle α, that is, the double-angle formulas: Double-Angle...

Equilateral triangle 0

Geometry

Equilateral triangle

Select your language EnglishSpanish The equilateral triangle is the regular polygon simplest. Its three sides are equal. Therefore, their angles are also the three equal. Since all angles are equal and the angles are...

Tangent 0

Trigonometry

Tangent

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

Altitude of a triangle 0

Geometry

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...

Leg 0

Geometry

Leg

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...

Scalene triangle 0

Geometry

Scalene Triangle

Select your language EnglishSpanish A scalene triangle is a triangle in which all three sides have different lengths and all angles are diferent too. This type of triangle can be a right triangle (one...

Pythagorean theorem 0

Geometry

Pythagorean Theorem

Select your language EnglishSpanish The Pythagorean Theorem describes a special relationship between the legs of a right triangle and its hypotenuse. A right triangle has one right angle (90°) and two minor angles (<90°)....

Isosceles triangle 0

Geometry

Isosceles Triangle

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...

Area of an isosceles triangle 0

Geometry

Area of an Isosceles Triangle

Select your language EnglishSpanish The area of an isosceles triangle is calculated from the base b (the non-repeated side) and the height (h) of triangle corresponding to the base. The area is the product...

Geometric mean theorem 10

Geometry

Geometric Mean Theorem

Select your language EnglishSpanish Geometric mean (or mean proportional) appears in two popular theorems regarding right triangles. The geometric mean theorem (or altitude theorem) states that the altitude to the hypotenuse of a right...