Angle relationships
10 videos
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13
Basic geometry and measurement - Angle Relationships: Your Geometry Toolkit
Learn the 5 essential angle rules: complementary, supplementary, vertical, parallel lines, and triangle angles. Master these to solve any missing angle problem.
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7
Basic geometry and measurement - Complementary and Supplementary Angles
Learn about complementary angles (add to 90°) and supplementary angles (add to 180°), with real-world examples showing how adjacent angles work together.
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1
Basic geometry and measurement - Vertical Angles Are Always Equal
Learn about vertical angles formed when two lines intersect. Discover why opposite angles are always equal and how angles on a straight line add up to 180 degrees.
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2
Basic geometry and measurement - Solving Equations with Angle Relationships
Learn to solve for x when two supplementary angles on a straight line add up to 180 degrees. Includes step-by-step equation solving and verification.
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2
Basic geometry and measurement - Parallel Lines and Transversals
Learn how parallel lines and transversals create angle relationships. Discover corresponding, alternate interior, and supplementary angles formed when a line crosses parallel lines.
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2
Basic geometry and measurement - Finding All Missing Angles with Parallel Lines
Learn how knowing one angle in parallel lines cut by a transversal lets you find all eight angles using supplementary, vertical, and corresponding angle rules.
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1
Basic geometry and measurement - Triangle Angles Always Add to 180°
Learn why the three interior angles of any triangle always add up to exactly 180 degrees, with visual examples and proof using parallel lines.
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Basic geometry and measurement - Finding Missing Angles in Triangles
Learn how to find missing angles in triangles using the 180-degree rule. Includes examples with numbers and variables, plus step-by-step solutions.
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0
Basic geometry and measurement - Isosceles and Equilateral Triangle Angles
Learn how isosceles and equilateral triangles have equal angles opposite equal sides, with examples showing how to calculate unknown angles using this shortcut property.
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3
Basic geometry and measurement - Exterior Angles and Multi-Step Angle Problems
Learn the exterior angle theorem: an exterior angle of a triangle equals the sum of the two non-adjacent interior angles, providing a quick shortcut for solving problems.