How to define the tangent ratio and identify the tangent of an angle in a right triangle.
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 function for all angles.
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 use inverse trig functions to find angles in right triangles.
How to define a tangent line; how to determine the angle a radius to a tangent forms.
How to classify a triangle based on its side lengths and angle measures.
How to evaluate the tangent of 3*pi/4.