Finding missing sides using trig

The sine function (sin) is the ratio of the length of the opposite side to the length of the hypotenuse.

The cosine function (cos) is the ratio of the length of the adjacent side to the length of the hypotenuse.

The tangent function (tan) is the ratio of the length of the opposite side to the length of the adjacent side.

Use the formula: Sin(θ) = opposite/hypotenuse, rearranged to find opposite: opposite = hypotenuse * Sin(θ).

Use the formula: Cos(θ) = adjacent/hypotenuse, rearranged to find adjacent: adjacent = hypotenuse * Cos(θ).

Use the formula: Tan(θ) = opposite/adjacent, rearranged to find opposite: opposite = adjacent * Tan(θ).

In a right triangle, a² + b² = c², where c is the hypotenuse and a and b are the other two sides.

Sine and cosine are co-functions: Sin(θ) = Cos(90° - θ) and Cos(θ) = Sin(90° - θ).

Look at the hundredths place; if it's 5 or more, round up the tenths place by one.

Hypotenuse = opposite / Sin(θ).