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

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

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

  • Transformations & Symmetry

    Transformations & Isometries
    Compositions of Transformations
    Glide Reflections

    Reflectional Symmetry
    Rotational Symmetry

  • Geometry Proofs & Reasoning

    Two Column Proofs
    Flowchart Proofs
    Special Isosceles Triangle Properties

    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

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

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

    Cyclic Quadrilaterals & Parallel Lines in Circles
    Arc Length

  • 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

    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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