How to define the sine ratio and identify the sine of an angle in a right triangle.
How to define the cosine ratio and identify the cosine of an angle in a right triangle.
How to define the tangent ratio and identify the tangent of an angle in a right triangle.
How to define the law of sines.
How to determine if two triangles in a circle are similar and how to prove that three similar triangles exist in a right triangle with an altitude.
How to write ratios to compare two quantities.
How to calculate the area of any triangle using two sides and an included angle.
How to use inverse trig functions to find angles in right triangles.