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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Perimeter of Irregular Shapes

SOHCAHTOA

Finding the Distance Between Two Points

Law of Cosines

Surface Area of a Cube

ACT Math 2.2 Coordinate Geometry

Introduction to 3D Geometry

Transformations

Geometric Word Problems

Proving Lines are Parallel

Converting Between Degrees and Radians

Polygons

Cosines

Translations and Functions

Properties of Equality and Congruence

Secant Angles

Perimeter of a Rectangle

Perimeter and Circumference

Coordinates and Distance Formula

Angles

Parallel Lines and Transversals

Surface Area of Cylinders

Law of Sines

Special Right Triangles

Characteristics of Parallelograms

Area of a Sector

Tangent Half-Angle Formula

Cubes: Surface Area and Volume

Volumes of Prisms and Cylinders

Midsegment Theorem

Attributes of Circles

A Midsummer Night's Dream

The Tangent Function

Collinearity

Coordinate Geometry

Lines, Segments and Rays

Proving Lines are Perpendicular

Angles of a Polygon

Rhombi

Sines

Linear Pairs

Transformaciones

Verifying Trig Identities

Area

Complementary and Supplementary Angles

Volume

Similar Figures

SAS, ASA, AAS

Solving Trigonometric Equations

Centers of a Triangle

30-60-90 Triangle

Vertical Angle Theorem

Slopes of Parallel and Perpendicular Lines

Proving Triangles Congruent

Exterior and Remote Interior Angles

Triangle Inequality Theorem

SSS Postulate

Triangles

Proving Triangles Congruent 2

Inscribed Angles

Volumen de un Cubo

Area of an Irregular Shape

Constructions

Equations of Circles

Area Formulas

Volumes of Pyramids and Cones