Trigonometric ratios in a circle of radius r

For the questions below, be sure to zoom out if you need to!

Question 1

Suppose [i]P(x,y)[/i] = any point that lies on a circle with center (0,0) and radius [i]r[/i], where [i]r[/i] > 0. [br]Use what you've observed to write an equation that expresses the relationship among trigonometric ratios and [i]x[/i], [i]y[/i], and [i]r:[/i][br]a) In QI

[math]sin\Theta=\frac{y}{r},cos\Theta=\frac{x}{r},tan\Theta=\frac{y}{x}[/math] [math]sin\Theta=\frac{x}{r},cos\Theta=\frac{y}{r},tan\Theta=\frac{y}{x}[/math] [math]sin\Theta=\frac{y}{x},cos\Theta=\frac{x}{r},tan\Theta=\frac{y}{r}[/math]

Question 2 (answer on your copybook)

Deduce the remaining trigonometric ratios in QI, (secant, cosecant, cotangent of an angle)

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