as the side we know is the opposite side (12cm), and the side we want to find out is the hypotenuse (x), we use the trigonometry ratio SIN to work this out.
sin = opp/hyp
replace the sides with their numbers
sin = 12/x
as the number we now number on the top of the fraction, we divide it by sin70°
The mnemonic SOH CAH TOA reminds you of the relationships between angles and sides of a right triangle. Here, you have the side opposite the given 70° angle, and you want to find the hypotenuse. The appropriate relation is ...
An imaginary number is a complex number that can be written as a real number multiplied by the imaginary unit i, which is defined by its property i² = −1. The square of an imaginary number bi is −b². For example, 5i is an imaginary number, and its square is −25
