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Similar Triangle Example Problems |
Geometry |
9 min |
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Similarity Example Problems |
Geometry |
8 min |
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Challenging Similarity Problem |
Geometry |
10 min |
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Similarity example where same side plays different roles |
Geometry |
6 min |
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Finding Area Using Similarity and Congruence |
Geometry |
10 min |
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Pythagorean Theorem Proof Using Similarity |
Geometry |
10 min |
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30-60-90 Triangle Side Ratios Proof |
Geometry |
7 min |
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45-45-90 Triangle Side Ratios |
Geometry |
6 min |
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30-60-90 Triangle Example Problem |
Geometry |
7 min |
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The Golden Ratio |
Geometry |
15 min |
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Introduction to angles (old) |
Geometry |
10 min |
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Angles (part 2) |
Geometry |
9 min |
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Angles (part 3) |
Geometry |
10 min |
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Angles formed between transversals and parallel lines |
Geometry |
8 min |
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Angles of parallel lines 2 |
Geometry |
5 min |
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The Angle Game |
Geometry |
9 min |
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Similar triangles |
Geometry |
10 min |
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Similar triangles (part 2) |
Geometry |
10 min |
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Angle Game (part 2) |
Geometry |
10 min |
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Acute Right and Obtuse Angles |
Geometry |
6 min |
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Area and Perimeter |
Geometry |
12 min |
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Circles: Radius, Diameter and Circumference |
Geometry |
11 min |
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Area of a circle |
Geometry |
7 min |
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The Pythagorean Theorem |
Geometry |
11 min |
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Pythagorean Theorem II |
Geometry |
10 min |
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45-45-90 Triangles |
Geometry |
10 min |
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Intro to 30-60-90 Triangles |
Geometry |
10 min |
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30-60-90 Triangles II |
Geometry |
5 min |
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Solid Geometry Volume |
Geometry |
4 min |
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Cylinder Volume and Surface Area |
Geometry |
8 min |
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Herons Formula |
Geometry |
5 min |
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Part 1 of Proof of Herons Formula |
Geometry |
11 min |
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Part 2 of the Proof of Herons Formula |
Geometry |
12 min |
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Inscribed and Central Angles |
Geometry |
14 min |
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Area of Inscribed Equilateral Triangle (some basic trig used) |
Geometry |
12 min |
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Right Triangles Inscribed in Circles (Proof) |
Geometry |
6 min |
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Area of Diagonal Generated Triangles of Rectangle are Equal |
Geometry |
5 min |
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Triangle Medians and Centroids |
Geometry |
9 min |
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Triangle Medians and Centroids (2D Proof) |
Geometry |
15 min |
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Rhombus Diagonals |
Geometry |
5 min |
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2003 AIME II Problem 7 |
Geometry |
13 min |
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Perpendicular Radius Bisects Chord |
Geometry |
7 min |
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Circumcenter of a Triangle |
Geometry |
12 min |
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Circumcenter of a Right Triangle |
Geometry |
6 min |
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Three Points Defining a Circle |
Geometry |
10 min |
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