FORMULABANK

REMEMBER:

• Angles are denoted by capital letters (A, B, and C).
• Sides are denoted by lowercase letters (a, b, and c).
• Angle C is always 90°.

Example:

If we know $a$ = 5 and $B$ = 52°, and we want to find the length of side $c$.

First, we look for the formulas for side $c$, then choose the one that includes $a$ and $B$.

$c=\frac{a}{cos\left(B\right)}$

Trigonometric Ratios:

$cos\left(\mathrm{angle}\right)=\frac{\mathrm{adjacent}}{\mathrm{hypotenuse}}$

$sin\left(\mathrm{angle}\right)=\frac{\mathrm{opposite}}{\mathrm{hypotenuse}}$

$tan\left(\mathrm{angle}\right)=\frac{\mathrm{opposite}}{\mathrm{adjacent}}$