Скачать или смотреть TR-28: The Law of Sines (Trigonometry series by Dennis F. Davis)

The Law of Sines is derived and demonstrated to be useful whenever we know the measure of an angle and its opposite side (called an angle-side opposite pair). The Law of Sines equates two fractions with three numbers we know and one we don't. So we can solve for the 4th number. The unknown we solve for will be either the length of a side or the sine of its opposite angle. If we are solving for an angle, we apply the arcsin function to the sine we determined.

Series introduction including complete video list:
TR-00: [   • TR-00: Introduction to Trigonometry Series...  ]

International A level, Intl A Level, IAL, Edexcel, Pearson exam board, CIE, Cambridge exam board, P3, P2, Year 10, Class 11