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

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