# High School Geometry

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We have a series of free, online High School Geometry Videos, Lessons and Solutions.

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Related Pages
Geometry Help
Common Core Math Geometry

### Geometry Building Blocks

• Area of 2-D Shapes

Area Formulas
Area of Parallelograms
Area of Triangles
Area of Trapezoids
Solving Formulas

Area of Polygons
Area of Kites & Rhombuses
Center & Apothem of Regular Polygons
Area of Regular Polygons

Area involving Circles
Area of Circles
Area of a Sector
Area of a Segment
Area of an Annulus
Regions Between Circles & Squares

• Surface Area of Solids

Surface Area
Surface Area of Prisms
Surface Area of Cylinders
Surface Area of Pyramids

Surface Area
Surface Area of Cone
Surface Area of Sphere
Surface Area of Joined Solids

• Volume of Solids

Volume
3-D Solid Properties
Volume of Prisms
Volume of Cylinders
Volume of Cones

Volume
Volume of Pyramids
Solving Equations with Squares & Cubes
Volume of Spheres
Surface Area of Spheres

• Transformations & Symmetry

Transformations
Transformations & Isometries
Translations
Reflections
Rotations
Compositions of Transformations
Glide Reflections

Symmetry
Reflectional Symmetry
Rotational Symmetry
Dilations

• Geometry Proofs & Reasoning

Proofs
CPCTC
Two Column Proofs
Flowchart Proofs
Special Isosceles Triangle Properties

Reasoning
Inductive Reasoning
Deductive Reasoning

• Constructions

Constructions 1
Duplicating a Line Segment
Duplicating an Angle
Constructing the Perpendicular Bisector
Constructing a Perpendicular at a Point on a Line
Constructing a Perpendicular to a Line

Constructions 2
Constructing an Angle Bisector
Constructing Parallel Lines
Constructing Altitudes
Constructing a Median

Constructions 3
Constructing a Triangle Midsegment
Point of Concurrency
Circumscribed & Inscribed Circles & Polygons
Constructing the Incenter

Constructions 4
Constructing the Circumcenter
Constructing the Orthocenter
Constructing the Centroid

• Circles, Tangents & Secants

Circles
Locus & Definition of a Circle & Sphere
Central Angles & Intercepted Arcs
Chords & a Circle’s Center

Tangents
Radii to Tangents
Tangent Segments to a Circle
Inscribed Angles
Angles in Semicircles & Chords to Tangents

Secants
Cyclic Quadrilaterals & Parallel Lines in Circles
Circumference
Arc Length
Secants

• Pythagorean Theorem

Pythagorean Theorem
Pythagorean Theorem Proofs
Square Root Operations
Using the Pythagorean Theorem to find a Missing Hypotenuse

Pythagorean Theorem
Using the Pythagorean Theorem to find a Missing Leg
Space Diagonals
Converse of the Pythagorean Theorem

Special Triangles
45-45-90 Triangles
30-60-90 Triangles

Pythagorean Theorem Formulas
Distance Formula
Equation of a Circle
Calculating Coordinates in the Unit Circle

• Basic Trigonometry

Trigonometry
Trigonometric Ratios: Sine
Trigonometric Ratios: Cosine
Trigonometric Ratios: Tangent
Inverse Trigonometric Functions

Application of Trigonometry
Angle of Elevation & Depression
Using Sine to Calculate the Area of a Triangle
The Law of Sines
The Law of Cosines

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