Formal proofs present the oh-so-mathematical evidence in two columns: one for the statement they are claiming is true, and the other for the reasoning behind them.

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Vertical Angle Theorem

Parallel Lines and Transversals

Translations and Functions

Triangle Inequality Theorem

Verifying Trig Identities

Properties of Equality and Congruence

Transformaciones

Inscribed Angles

Converting Between Degrees and Radians

Centers of a Triangle

Similar Figures

Solving Trigonometric Equations

Polygons

Finding the Distance Between Two Points

A Midsummer Night's Dream

Introduction to 3D Geometry

Transformations

Secant Angles

Area Formulas

Proving Triangles Congruent 2

Sines

Proving Lines are Parallel

Tangent Half-Angle Formula

Equations of Circles

SOHCAHTOA

Cubes: Surface Area and Volume

SSS Postulate

Complementary and Supplementary Angles

Angles

Proving Lines are Perpendicular

Volumen de un Cubo

Volumes of Prisms and Cylinders

30-60-90 Triangle

Surface Area of Cylinders

Lines, Segments and Rays

Geometric Word Problems

Area of a Sector

Slopes of Parallel and Perpendicular Lines

Proving Triangles Congruent

Surface Area of a Cube

Coordinate Geometry

Coordinates and Distance Formula

Volume

Law of Sines

ACT Math 2.2 Coordinate Geometry

Characteristics of Parallelograms

Midsegment Theorem

Perimeter of a Rectangle

Constructions

Law of Cosines

Triangles

The Tangent Function

Perimeter and Circumference

Area of an Irregular Shape

Special Right Triangles

Volumes of Pyramids and Cones

Attributes of Circles

Linear Pairs

SAS, ASA, AAS

Exterior and Remote Interior Angles

Angles of a Polygon

Collinearity

Rhombi

Perimeter of Irregular Shapes

Cosines

Area