Geometry

Videos on geometry. Basic understanding of Algebra I necessary. After this, you'll be ready for Trigonometry.

Lectures

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   Lecture 1 - Introduction to Angles

   What an angle is. Angles in a circle. Complementary and supplementary angles.

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   Lecture 2 - Angles Part 2

   More on complementary and supplementary angles. Introduction to opposite angles.

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   Lecture 3 - Angles Part 3

   Angles formed when a transversal intersects parallel lines.

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   Lecture 4 - Angles Formed Between Transversals and Parallel Lines

   Angles of parallel lines.

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   Lecture 5 - Angles of Parallel Lines 2

   Angles of parallel lines examples.

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   Lecture 6 - The Angle Game

   Using what we know to solve for angles in the Angle Game.

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   Lecture 7 - Similar Triangles

   Introduction to similar triangles.

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   Lecture 8 - Similar Triangles 2

   More on similar triangles.

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   Lecture 9 - Area and Perimeter

   Area of rectangles and triangles. Perimeter of rectangles.

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    Lecture 10 - Circles: Radius, Diameter, and Circumference

    Understanding the relationship between the radius diameter and circumference of a circle.

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    Lecture 11 - Area of a Circle

    Area of a circle and how it relates to radius and diameter.

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    Lecture 12 - The Pythagorean Theorem

    Introduction to the Pythagorean Theorem.

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    Lecture 13 - The Pythagorean Theorem II

    More Pythagorean Theorem examples. Introduction to 45-45-90 triangles.

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    Lecture 14 - 45-45-90 Triangles

    Introduction to 45-45-90 Triangles.

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    Lecture 15 - Intro to 30-60-90 Triangles

    A few more 45-45-90 examples and an introduction to 30-60-90 triangles.

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    Lecture 16 - 30-60-90 Triangles II

    More examples using 30-60-90 triangles.

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    Lecture 17 - Heron's Formula

    Using Heron's Formula to determine the area of a triangle while only knowing the lengths of the sides.

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    Lecture 18 - Part 1 of Proof of Heron's Formula

    Part 1 of the proof of Heron's Formula.

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    Lecture 19 - Part 2 of Proof of Heron's Formula

    Showing that the expression in part 1 is identical to Heron's Formula.

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    Lecture 20 - An Inscribed Angle is Half of a Central Angle that Subtends the Same Arc

    Showing that an inscribed angle is half of a central angle that subtends the same arc.

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    Lecture 21 - Area of Inscribed Equilateral Triangle (Some Basic Trig Used) 2

    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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    Lecture 22 - Right Triangles Inscribed in Circles

    Proof showing that a triangle inscribed in a circle having a diameter as one side is a right triangle.

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    Lecture 23 - Area of Inscribed Equilateral Triangle (Some Basic Trig Used)

    Area of Diagonal Generated Triangles of Rectangle are Equal.