when is better to use the unit circle vs. right triangles vs. trigonometric identities? Give an example of each and explain why.

In an introductory trignometry course, there are many options for introducing trigonometric functions: • As ratios of sides of right triangles ...

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a² + b²= c²

24² + 7² = c²

c= 25

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: