This is a scalene triangle. All the sides are different lengths and each angle is different as well. This one’s a right angled triangle, where one angle is always a right angle, so that's 90 ...

For a given angle Ɵ, tanƟ = opposite ÷ adjacent. This is written as a fraction. Image caption, These three equations are true for all right-angled triangles. They are known as the three ...