Right-Angled Triangles

Pythagoras' Theorem

In a right angled triangle, the square of the hypotenuse (c) is equal to the sum of the squares of the other two sides (a and b). c² = a² + b².

Trigonometry

The study of the relationship between angles and side lengths of triangles.

Hypotenuse

The longest side of a right angled triangle.

Adjacent

The short side next to a given angle in a right-angled triangle.

Opposite

The short side across from a given angle in a right-angled triangle.

Theta (θ)

Lower case greek letter used as a variable to represent an angle.

Angle of elevation

The angle formed by a horizontal line and a line of sight to a point above the line.

Bearing

The angle in degrees measuring clockwise from north given as three figures.

Back bearing

Bearings in exactly opposite directions that are always 180° apart.