How to use the sine and cosine addition formulas to prove the double-angle formulas.
How to define and identify vertical angles.
How to identify a trapezoid and its special properties.
How to find a two-sided limit by investigating one-sided limits.
How to derive two more cosine double-angle formulas.
How to use one-sided limits to find a vertical asymptote.
How to define and construct an angle bisector.
How to classify a triangle based on its side lengths and angle measures.
How to calculate the area of any triangle using two sides and an included angle.
How to find the angle between planes, and how to determine if two planes are parallel or perpendicular.
How to solve an equation with a square root.
How to define a rhombus and compare it to a square and rectangle.
How to identify if two figures are similar.
How to define a triangle midsegment and describe its special properties.
How to identify a kite and its special properties.
How to derive the area formula of a kite based on the rectangle formula; how to calculate the area of a rectangle using diagonal lengths.