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773What is the Pythagorean Theorem?
774Visual Proof Using Squares
775Finding the Hypotenuse
776Finding a Missing Leg
777Pythagorean Theorem with Fractions and Decimals
778Word Problems Involving Right Triangles
779Right Triangles on the Coordinate Plane
780The Pythagorean Theorem in 3D
781Multi-Step Problems with Multiple Triangles
782Simplifying Radical Answers
783Introduction to Pythagorean Triples
784Verifying Pythagorean Triples
785Generating Multiples of Basic Triples
786Primitive vs. Non-Primitive Triples
787The Converse of the Pythagorean Theorem
788Using the Converse to Identify Right Triangles
789Acute and Obtuse Triangle Tests
790Applications of Triples and the Converse
791Introduction to Special Right Triangles
792The 45-45-90 Triangle: Side Ratios
793Finding Missing Sides in 45-45-90 Triangles
794The 30-60-90 Triangle: Side Ratios
795Finding Missing Sides in 30-60-90 Triangles
796Recognizing Special Triangles from Angles
797Applications in Geometric Figures
798Special Triangles in Coordinate Geometry
799Comparing Special Triangles with Pythagorean Theorem
800The Altitude to the Hypotenuse
801Geometric Mean: Altitude and Hypotenuse Segments
802Geometric Mean: Leg and Its Hypotenuse Segment
803Proving Geometric Mean Relations Using Similarity
804Finding Missing Lengths with Geometric Means
805Comparing Pythagorean Theorem and Geometric Mean Methods
806Applications of Geometric Mean in Right Triangles

773What is the Pythagorean Theorem?
774Visual Proof Using Squares
775Finding the Hypotenuse
776Finding a Missing Leg
777Pythagorean Theorem with Fractions and Decimals
778Word Problems Involving Right Triangles
779Right Triangles on the Coordinate Plane
780The Pythagorean Theorem in 3D
781Multi-Step Problems with Multiple Triangles
782Simplifying Radical Answers
783Introduction to Pythagorean Triples
784Verifying Pythagorean Triples
785Generating Multiples of Basic Triples
786Primitive vs. Non-Primitive Triples
787The Converse of the Pythagorean Theorem
788Using the Converse to Identify Right Triangles
789Acute and Obtuse Triangle Tests
790Applications of Triples and the Converse
791Introduction to Special Right Triangles
792The 45-45-90 Triangle: Side Ratios
793Finding Missing Sides in 45-45-90 Triangles
794The 30-60-90 Triangle: Side Ratios
795Finding Missing Sides in 30-60-90 Triangles
796Recognizing Special Triangles from Angles
797Applications in Geometric Figures
798Special Triangles in Coordinate Geometry
799Comparing Special Triangles with Pythagorean Theorem
800The Altitude to the Hypotenuse
801Geometric Mean: Altitude and Hypotenuse Segments
802Geometric Mean: Leg and Its Hypotenuse Segment
803Proving Geometric Mean Relations Using Similarity
804Finding Missing Lengths with Geometric Means
805Comparing Pythagorean Theorem and Geometric Mean Methods
806Applications of Geometric Mean in Right Triangles

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Lesson 789 of 3,121·19. Right Triangles and PythagorasPro lesson

Acute and Obtuse Triangle Tests

Learn that a² + b² > c² indicates an acute triangle and a² + b² < c² indicates an obtuse triangle.

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