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Intro to Euclidean geometry

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Euclid as the father of geometry

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Terms & labels in geometry

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Lines, line segments, & rays

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Specifying planes in three dimensions

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Geometric definitions example

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Angles

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Measuring angles in degrees

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Measuring angles using a protractor

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Measuring angles using a protractor 2

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Acute, right, & obtuse angles

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Vertical angles

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Equation practice with vertical angles

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Complementary & supplementary angles

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Equation practice with complementary angles

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Equation practice with supplementary angles

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Angles, parallel lines, & transversals

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Parallel & perpendicular lines

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Missing angles with a transversal

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Measures of angles formed by a transversal

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Proving angles are congruent

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Polygons

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Angles in a triangle sum to 180° proof

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Triangle exterior angle example

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Worked example: Triangle angles (intersecting lines)

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Worked example: Triangle angles (diagram)

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Triangle angle challenge problem 2

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Sum of interior angles of a polygon

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Sum of the exterior angles of a polygon

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Triangle inequality theorem

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Intro to quadrilateral

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Quadrilateral properties

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Kites as a geometric shape

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Quadrilateral types

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Proof: Opposite sides of a parallelogram

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Proof: Opposite angles of a parallelogram

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Area

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Perimeter & area

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Area of a triangle

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Area of a parallelogram

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Area of trapezoids

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Area of kites

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Area of a triangle on a grid

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Area of a quadrilateral on a grid

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Area of composite shapes

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Perimeter & area of composite shapes

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Challenge problems: perimeter & area

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Radius, diameter, circumference & π

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Area of a circle

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Radius & diameter from circumference

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Area of a circle intuition

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Intro to nets of polyhedra

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Surface area using a net: rectangular prism