can be used to find a missing side in a right-angled triangle when another side and an angle are known. An understanding of the three trigonometric ratios and how to change the subject of a ...

Save guides, add subjects and pick up where you left off with your BBC account. The sides of right-angled triangles are labelled opposite, hypotenuse and adjacent. Trigonometry explores the ...

Two planets orbit the poles while another revolves around the star’s equator, suggesting a mysterious, undetected force. By Jonathan O’Callaghan Star systems come in all shapes and sizes. Some ...

The authors do not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and have disclosed no relevant affiliations beyond ...