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.

Up Next:

Coordinate Geometry

Proving Triangles Congruent

Law of Cosines

Converting Between Degrees and Radians

Cosines

Area Formulas

Surface Area of Cylinders

A Midsummer Night's Dream

Proving Lines are Perpendicular

Attributes of Circles

Inscribed Angles

Geometric Word Problems

Triangles

Complementary and Supplementary Angles

Similar Figures

Characteristics of Parallelograms

ACT Math 2.2 Coordinate Geometry

SSS Postulate

SOHCAHTOA

Secant Angles

Coordinates and Distance Formula

Slopes of Parallel and Perpendicular Lines

Exterior and Remote Interior Angles

Lines, Segments and Rays

Angles

Vertical Angle Theorem

Constructions

Midsegment Theorem

Area of an Irregular Shape

Surface Area of a Cube

Volumes of Pyramids and Cones

Volumen de un Cubo

The Tangent Function

Triangle Inequality Theorem

Finding the Distance Between Two Points

Area

Volumes of Prisms and Cylinders

Equations of Circles

Properties of Equality and Congruence

Linear Pairs

Proving Lines are Parallel

Verifying Trig Identities

Transformaciones

Law of Sines

30-60-90 Triangle

Transformations

Tangent Half-Angle Formula

Translations and Functions

Perimeter of a Rectangle

Special Right Triangles

Cubes: Surface Area and Volume

Area of a Sector

Proving Triangles Congruent 2

SAS, ASA, AAS

Introduction to 3D Geometry

Polygons

Rhombi

Angles of a Polygon

Perimeter and Circumference

Perimeter of Irregular Shapes

Centers of a Triangle

Solving Trigonometric Equations

Sines

Parallel Lines and Transversals

Volume

Collinearity