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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Similar Figures

Proving Triangles Congruent

The Tangent Function

Vertical Angle Theorem

Perimeter of a Rectangle

Equations of Circles

Translations and Functions

Volume

Surface Area of Cylinders

Law of Sines

Properties of Equality and Congruence

Area Formulas

Coordinate Geometry

Inscribed Angles

Lines, Segments and Rays

Secant Angles

Triangles

Proving Lines are Perpendicular

Geometric Word Problems

SAS, ASA, AAS

Polygons

Coordinates and Distance Formula

Cosines

Constructions

Perimeter of Irregular Shapes

Midsegment Theorem

Area

Collinearity

A Midsummer Night's Dream

Characteristics of Parallelograms

Volumes of Pyramids and Cones

Complementary and Supplementary Angles

SSS Postulate

ACT Math 2.2 Coordinate Geometry

Slopes of Parallel and Perpendicular Lines

Introduction to 3D Geometry

Finding the Distance Between Two Points

30-60-90 Triangle

Linear Pairs

Verifying Trig Identities

Parallel Lines and Transversals

Converting Between Degrees and Radians

Transformations

Angles of a Polygon

Cubes: Surface Area and Volume

Volumen de un Cubo

SOHCAHTOA

Proving Lines are Parallel

Sines

Area of a Sector

Law of Cosines

Angles

Area of an Irregular Shape

Transformaciones

Special Right Triangles

Proving Triangles Congruent 2

Triangle Inequality Theorem

Tangent Half-Angle Formula

Solving Trigonometric Equations

Surface Area of a Cube

Attributes of Circles

Centers of a Triangle

Exterior and Remote Interior Angles

Rhombi

Volumes of Prisms and Cylinders

Perimeter and Circumference