High School Geometry
A series of free High School Geometry Video Lessons from Brightstorm.
Geometry Building Blocks
Three Undefined Terms: Point, Line, and Plane
Counterexample
Writing a Good Definition
Postulate, Axiom, Conjecture
Math Converse
Line Segments
Rays
Parallel and Skew Lines
Midpoints and Congruent Segments
Parallel Planes and Lines
Vertex and Diagonals
Calculating the Midpoint
Angles: Types and Labeling
Using a Protractor
Angle Bisectors
Supplementary and Complementary Angles
Polygons
Types of Triangles
Perimeter
Parts of a Circle
Triangles
Triangle Angle Sum
Isosceles Triangles
Triangle Side Inequalities
Triangle Side and Angle Inequalities
Remote Interior Angles
Congruent Trisngles
SSS and SAS
ASA and AAS
Hypotenuse Leg (HL)
Why SSA and AAA Don't Work as Congruence Shortcuts
Geometry Proofs
CPCTC
Two Column Proofs
Flowchart Proofs
Special Isosceles Triangle Properties
Transformations
Transformations and Isometries
Translations
Reflections
Rotations
Compositions of Transformations
Reflectional Symmetry
Rotational Symmetry
Dilations
Glide Reflections
Volume
3-D Solid Properties
Volume of Prisms
Volume of Cylinders
Volume of Cones
Volume of Pyramids
Solving Equations with Squares and Cubes
Volume of Spheres
Surface Area of Spheres
Reasoning
Inductive Reasoning
Deductive Reasoning
Diagonals
Number of Diagonals in a Polygon
Number of Handshakes at a Party
Angles and Parallel Lines
Adjacent Angles
Vertical Angles
Corresponding Angles
Alternate Interior Angles
Alternate Exterior Angles
Same Side Interior and Same Side Exterior Angles
Converse of Parallel Lines Theorem
Angles of Polygons
Polygon Angle Sum
Equiangular Polygon Sums
Exterior Angles of a Polygon
Properties of Polygons
Kite Properties
Trapezoid Properties
Triangle Midsegment Properties
Trapezoid Midsegment Properties
Parallelogram Properties
Trapezoid Arch and Panel Design Problem
Rhombus Properties
Rectangle and Square Properties
Area of 2-D Shapes
Area of Parallelograms
Area of Triangles
Area of Trapezoids
Solving Formulas
Area of Kites and Rhombuses
Center and Apothem of Regular Polygons
Area of Regular Polygons
Area of Circles
Area of a Sector
Area of a Segment
Area of an Annulus
Regions Between Circles and Squares
Surface Area of Solids
Surface Area of Prisms
Surface Area of Cylinders
Surface Area of Pyramids
Surface Area of Cone
Surface Area of Sphere
Surface Area of Joined Solids
Similar Triangles and Polygons
Solving Proportions
Properties of Similar Polygons
Similarity Shortcuts
Similar Triangles in Circles and Right Triangles
Indirect Measurement
Proportional Segments Between Parallel Lines
Corresponding Parts of Similar Triangles
Angle Bisectors and Opposite Side Ratios
Similarity and Area Ratios
Similarity and Volume Ratios
Constructions
Duplicating a Line Segment
Duplicating an Angle
Constructing the Perpendicular Bisector
Constructing a Perpendicular to a Line
Constructing an Angle Bisector
Constructing Parallel Lines
Constructing Altitudes
Constructing a Median
Constructing a Triangle Midsegment
Point of Concurrency
Circumscribed and Inscribed Circles and Polygons
Constructing the Incenter
Constructing the Circumcenter
Constructing the Orthocenter
Constructing the Centroid
Constructing a Perpendicular at a Point on a Line
Circles
Locus and Definition of a Circle and Sphere
Central Angles and Intercepted Arcs
Chords and a Circle's Center
Radii to Tangents
Tangent Segments to a Circle
Inscribed Angles
Angles in Semicircles and Chords to Tangents
Cyclic Quadrilaterals and Parallel Lines in Circles
Circumference
Arc Length
Secants
Pythagorean Theorem
Pythagorean Theorem Proofs
Square Root Operations
Using the Pythagorean Theorem to find a Missing Hypotenuse
Using the Pythagorean Theorem to find a Missing Leg
Space Diagonals
Converse of the Pythagorean Theorem
45-45-90 Triangles
30-60-90 Triangles
Distance Formula
Equation of a Circle
Calculating Coordinates in the Unit Circle
Basic Trigonometry
Trigonometric Ratios: Sine
Trigonometric Ratios: Cosine
Trigonometric Ratios: Tangent
Inverse Trigonometric Functions
Angle of Elevation and Depression
Using Sine to Calculate the Area of a Triangle
The Law of Sines
The Law of Cosines
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