Sine and Cosine Law

Sine Law

Each side of a triangle is directly proportional to the sine of the opposite angle.

Sine Law

 

Cosine Law

In a triangle the square of every side is equal to the sum of the squares of the other two less the double product of the product of both for the cosine of the angle that they form.

Cosine Law

Law of Tangents

Law of Tangents

Area of a Triangle

The area of a triangle is half the product of the base and the height.

Area of a Triangle

The area of a triangle is half the product of two sides by the sine of the angle that they form.

Area of a Triangle

The area of a triangle is the quotient between the product of its sides and four times the radius of its circumscribed circle.

Area of a Triangle

The area of a triangle is equal to the product of the radius of the inscribed circle by the semiperimeter.

Area of a Triangle

Semiperimeter

Heron's formula:

Heron's Formula