How to derive the equation for the distance between two points using the Pythagorean Theorem.
How to determine if two triangles are similar using a shortcut.
How to relate corresponding altitudes, medians and angle bisectors in similar triangles.
How to relate the sides of an angle bisected and the lengths of the opposite side.
How to define indirect variation.
How to identify a segment from the vertex angle in an isosceles triangle to the opposite side.
How to define a polygon, how to distinguish between concave and convex polygons, how to name polygons.
How to define an altitude and draw them on acute, right, and obtuse triangles.
How to define a secant; how to find the length of various secants in circles.
How to identify if two figures are similar.
Short, helpful video on ACT prealgebra by top ACT prep instructor, Devorah. Videos are produced by leading online education provider, Brightstorm.
How to find the midpoint of a segment with endpoints in rectangular coordinates, How to write the midpoint formula.
How to understand what vectors are, and how they can be represented geometrically.