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