The Trigonometry of the Right Angled Triangle

This unit from the Continuing Mathematics Project is concerned with the calculation of the sides and angles of triangles and how this is used by the surveyor, the navigator, and the cartographer. The development of the television, the light and the road have all relied on trigonometry.

The objectives of the unit are that students will be able:
(i) to use the appropriate sine, cosine, or tangent ratio to determine the lengths of the sides of a right angled triangle or to find its angles;
(ii) to use tables of natural sines, cosines, and tangents to find the value of a ratio;
(iii) to use the appropriate cosecant, secant and cotangent ratio to solve problems involving right angled triangles;
(iv) to use the tables of the logarithms of the sine, cosine and tangent ratios.

• URL: http://stem.org.uk/rx7d2