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Chapter 03Trigonometry

0103.01Triangle Basics
0203.02Types of Triangles
0303.03Similar and Congruent Triangles
0403.04Pythagorean Theorem and Special Triangles
0503.05Sine, Cosine, and Tangent
0603.06The Unit Circle
0703.07Secant, Cosecant, and Cotangent
0803.08Trigonometric Identities
0903.09Solving Trigonometric Equations
1003.10Inverse Trigonometric Functions
1103.11The Law of Sines
1203.12The Law of Cosines

Chapter 03 · Trigonometry

0103.01Triangle Basics
0203.02Types of Triangles
0303.03Similar and Congruent Triangles
0403.04Pythagorean Theorem and Special Triangles
0503.05Sine, Cosine, and Tangent
0603.06The Unit Circle
0703.07Secant, Cosecant, and Cotangent
0803.08Trigonometric Identities
0903.09Solving Trigonometric Equations
1003.10Inverse Trigonometric Functions
1103.11The Law of Sines
1203.12The Law of Cosines

Topics / 03 Trigonometry

03.04

Pythagorean Theorem and Special Triangles

a² + b² = c² for right triangles, plus the two special triangles whose sides you should know by heart.

About 15 minutes

You'll learn to

→Use the Pythagorean theorem to find a missing side
→Recognize Pythagorean triples
→Use 45-45-90 and 30-60-90 side ratios

← 03.03 Similar and Congruent Triangles 03.05 Sine, Cosine, and Tangent →

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