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Mathematics

807Interior Angles of a Triangle
808Interior Angle Sum Formula for Polygons
809Finding Individual Interior Angles in Regular Polygons
810Exterior Angles of Polygons
811Exterior Angle Sum Theorem
812Finding Individual Exterior Angles in Regular Polygons
813Using Angle Sums to Find Unknown Angles
814Determining the Number of Sides from Angle Information
815Defining Quadrilaterals and Basic Properties
816Parallelograms: Definition and Properties
817Proving Quadrilaterals Are Parallelograms
818Rectangles: Properties and Characteristics
819Rhombuses: Properties and Characteristics
820Squares: The Ultimate Special Quadrilateral
821Trapezoids: Definitions and Basic Properties
822Isosceles Trapezoids
823Midsegment Theorem for Trapezoids
824Kites: Properties and Diagonal Relationships
825The Quadrilateral Family Tree
826Coordinate Geometry of Quadrilaterals
827Parts of a Circle: Center, Radius, Diameter, and Chord
828Circumference of a Circle
829Area of a Circle
830Circles and Pi (π)
831Concentric Circles and Annuli
832Inscribed and Circumscribed Circles
833Central Angles and Their Measures
834Distance from Center to Chord
835Congruent Circles and Circle Relationships
836Central Angles and Intercepted Arcs
837Arc Length Formula
838Inscribed Angles
839Angles Inscribed in a Semicircle
840Angles Formed by Chords
841Angles Formed by Secants and Tangents Outside
842Sector Area Formula
843Segment Area
844Arc Addition and Subtraction
845Congruent Arcs and Central Angles
846Applications of Arcs and Sectors
847Tangent Lines to Circles
848Properties of Tangents from an External Point
849Tangent-Radius Perpendicularity Theorem
850Chord Properties and Definitions
851Perpendicular Bisector of a Chord
852Equidistant Chords Theorem
853Intersecting Chords Theorem
854Secants and Tangent-Secant Relationships
855Applications of Tangents and Chords

Mathematics

807Interior Angles of a Triangle
808Interior Angle Sum Formula for Polygons
809Finding Individual Interior Angles in Regular Polygons
810Exterior Angles of Polygons
811Exterior Angle Sum Theorem
812Finding Individual Exterior Angles in Regular Polygons
813Using Angle Sums to Find Unknown Angles
814Determining the Number of Sides from Angle Information
815Defining Quadrilaterals and Basic Properties
816Parallelograms: Definition and Properties
817Proving Quadrilaterals Are Parallelograms
818Rectangles: Properties and Characteristics
819Rhombuses: Properties and Characteristics
820Squares: The Ultimate Special Quadrilateral
821Trapezoids: Definitions and Basic Properties
822Isosceles Trapezoids
823Midsegment Theorem for Trapezoids
824Kites: Properties and Diagonal Relationships
825The Quadrilateral Family Tree
826Coordinate Geometry of Quadrilaterals
827Parts of a Circle: Center, Radius, Diameter, and Chord
828Circumference of a Circle
829Area of a Circle
830Circles and Pi (π)
831Concentric Circles and Annuli
832Inscribed and Circumscribed Circles
833Central Angles and Their Measures
834Distance from Center to Chord
835Congruent Circles and Circle Relationships
836Central Angles and Intercepted Arcs
837Arc Length Formula
838Inscribed Angles
839Angles Inscribed in a Semicircle
840Angles Formed by Chords
841Angles Formed by Secants and Tangents Outside
842Sector Area Formula
843Segment Area
844Arc Addition and Subtraction
845Congruent Arcs and Central Angles
846Applications of Arcs and Sectors
847Tangent Lines to Circles
848Properties of Tangents from an External Point
849Tangent-Radius Perpendicularity Theorem
850Chord Properties and Definitions
851Perpendicular Bisector of a Chord
852Equidistant Chords Theorem
853Intersecting Chords Theorem
854Secants and Tangent-Secant Relationships
855Applications of Tangents and Chords

← Mathematics

Lesson 817 of 3,121·20. Polygons, Quadrilaterals, and CirclesPro lesson

Proving Quadrilaterals Are Parallelograms

Master the five conditions to prove a quadrilateral is a parallelogram using sides, angles, and diagonals.

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