Videos on geometry. Basic understanding of Algebra I necessary. After this, you'll be ready for Trigonometry.
What an angle is. Angles in a circle. Complementary and supplementary angles.
More on complementary and supplementary angles. Introduction to opposite angles.
Understanding the relationship between the radius diameter and circumference of a circle.
More Pythagorean Theorem examples. Introduction to 45-45-90 triangles.
A few more 45-45-90 examples and an introduction to 30-60-90 triangles.
Using Heron's Formula to determine the area of a triangle while only knowing the lengths of the sides.
Showing that the expression in part 1 is identical to Heron's Formula.
Showing that an inscribed angle is half of a central angle that subtends the same arc.
Problem that requires us to figure out the area of an equilateral triangle inscribed in a circle (A little trigonometry used).
Proof showing that a triangle inscribed in a circle having a diameter as one side is a right triangle.
Area of Diagonal Generated Triangles of Rectangle are Equal.