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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Surface Area of a Cube

Complementary and Supplementary Angles

Collinearity

Proving Lines are Perpendicular

Volumen de un Cubo

A Midsummer Night's Dream

Area Formulas

Geometric Word Problems

Proving Triangles Congruent

Verifying Trig Identities

Surface Area of Cylinders

Triangles

Cosines

SAS, ASA, AAS

Rhombi

Polygons

Similar Figures

Special Right Triangles

Proving Triangles Congruent 2

Volumes of Prisms and Cylinders

Sines

Secant Angles

Tangent Half-Angle Formula

Translations and Functions

Law of Cosines

Slopes of Parallel and Perpendicular Lines

Area of an Irregular Shape

Linear Pairs

Inscribed Angles

The Tangent Function

Introduction to 3D Geometry

SOHCAHTOA

ACT Math 2.2 Coordinate Geometry

Vertical Angle Theorem

Coordinates and Distance Formula

Coordinate Geometry

Transformations

Characteristics of Parallelograms

Attributes of Circles

Properties of Equality and Congruence

Transformaciones

Perimeter and Circumference

Finding the Distance Between Two Points

Lines, Segments and Rays

Parallel Lines and Transversals

Centers of a Triangle

Area

Volume

Converting Between Degrees and Radians

Solving Trigonometric Equations

Equations of Circles

Cubes: Surface Area and Volume

Perimeter of Irregular Shapes

Angles of a Polygon

30-60-90 Triangle

SSS Postulate

Volumes of Pyramids and Cones

Area of a Sector

Perimeter of a Rectangle

Midsegment Theorem

Proving Lines are Parallel

Law of Sines

Constructions

Triangle Inequality Theorem

Angles

Exterior and Remote Interior Angles