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High School Geometry

Related Topics:
Geometry Help
Common Core Math Geometry
Need help in High School Geometry?
We have a series of free, online High School Geometry Videos, Lessons and Solutions.

Geometry Building Blocks

  • Triangle Theorems & Polygons
    Triangle Theorems
    Triangle Angle Sum
    Isosceles Triangles
    Triangle Side Inequalities
    Triangle Side & Angle Inequalities
    Remote Interior Angles

    Congruent Triangles
    SSS & SAS
    ASA & AAS
    Hypotenuse Leg (HL)
    Why SSA & AAA Don't Work as Congruence Shortcuts

    Similar Triangles & Polygons
    Solving Proportions
    Properties of Similar Polygons
    Similarity Shortcuts
    Similar Triangles in Circles & Right Triangles
    Indirect Measurement

    Similar Polygons
    Proportional Segments Between Parallel Lines
    Corresponding Parts of Similar Triangles
    Angle Bisectors & Opposite Side Ratios
    Similarity & Area Ratios
    Similarity & Volume Ratios
  • Angles & Parallel Lines
    Adjacent Angles
    Vertical Angles
    Corresponding Angles

    Parallel Lines
    Alternate Interior Angles
    Alternate Exterior Angles
    Same Side Interior & Same Side Exterior Angles
    Converse of Parallel Lines Theorem

  • 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
  • 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
  • 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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