It is important to remember other angles rules, such as angles on a straight line add up to 180°, and to recognise angles in parallel lines. Make sure you are confident in applying Pythagoras’ theorem ...

Circles have different angle properties, described by a number of theorems. This is one of two guides on circle theorems, with this guide covering the following: the angle subtended by an arc at the ...

Consumer theory examines how consumers allocate income and make purchasing decisions. All economic activity takes place within the context of limitations. Consumers, therefore, need to make trade-offs ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Yarilet Perez is an experienced multimedia ...

As Forbes Advisor's Editorial Director of Growth Projects, Emily looks after driving editorial innovation and audience engagement through new channels. She oversees the vision for audience-generating ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Somer G. Anderson is CPA, doctor of accounting, and an accounting and finance professor who ...