# triangle congruence   88 videos

• #### The Law of Cosines

##### TrigonometryBasic Trigonometry

How to define and use the law of cosines.

law of cosines ratios triangles
• #### The Law of Sines

##### PrecalculusBasic Trigonometry

How to define the law of sines.

law of sines ratios triangles
• #### The Law of Cosines

##### PrecalculusBasic Trigonometry

How to define and use the law of cosines.

law of cosines ratios triangles
• #### Properties of Similar Polygons

##### GeometrySimilarity

How to identify if two figures are similar.

similar figures corresponding angles congruence corresponding sides proportional
• #### Polygon Angle Sum

##### GeometryPolygons

How to derive the formula to find the sum of angles in any polygon.

triangle angle sum diagonal polygon
• #### Equiangular Polygon Sums

##### GeometryPolygons

How to find the measure of one angle in any equiangular or regular polygon.

equiangular regular congruent triangles sum
• #### The Distance Formula in Polar Coordinates

##### PrecalculusPolar Coordinates and Complex Numbers

How to derive the distance formula for polar coordinates.

polar coordinates the law of cosines triangles
• #### Solving Formulas

##### GeometryArea

How to strategize about solving formulas for variables; how to solve the area of a rectangle formula for base and height; how to solve the area of a triangle formula for base and for height.

formulas isolating a variable rectangle area triangle area trapezoid area regular polygon area
• #### Polygons

##### Pre-AlgebraIntroductory Geometry

Naming polygons, classifying triangles, and classifying quadrilaterals

• #### Applied Linear Equations: Geometry Problem

##### Algebra 2Linear Equations

How to find the angles of a triangle by creating a linear equation.

word problem angle measure
• #### Applied Linear Equations: Geometry Problem

##### PrecalculusLinear Equations and Inequalities

How to find the angles of a triangle by creating a linear equation.

word problem angle measure
• #### Finding the Slope of a Line from a Graph

##### AlgebraLinear Equations and Their Graphs

How to find the slope of a line if given a graph.

slope change ratio fraction slope triangle
• #### Two Column Proofs

##### GeometryTriangles

How to organize a two column proof.

statement reason cpctc prove show congruent triangles
• #### Rotational Symmetry

##### GeometryTransformations

How to define rotational symmetry and identify the degree of rotational symmetry of common regular polygons.

symmetry rotation point symmetry image equilateral triangle
• #### Using the Pythagorean Theorem to find a Missing Leg

##### GeometryPythagorean Theorem

How to use the Pythagorean Theorem to find a missing leg, given the length of the hypotenuse and a leg.

Pythagorean theorem leg hypotenuse right triangle
• #### Finding the Slope of a Line from a Graph

##### Algebra 2Graphs of Linear Equations

How to find the slope of a line if given a graph.

slope change ratio fraction slope triangle
• #### Using the Pythagorean Theorem to find a Missing Leg

##### TrigonometryPythagorean Theorem

How to use the Pythagorean Theorem to find a missing leg, given the length of the hypotenuse and a leg.

Pythagorean theorem leg hypotenuse right triangle
• #### The Tangent Function

##### TrigonometryTrigonometric Functions

How to define the tangent function for all angles.

tangent right triangle trigonometry the unit circle
• #### The Tangent Function

##### PrecalculusTrigonometric Functions

How to define the tangent function for all angles.

tangent right triangle trigonometry the unit circle
• #### Trapezoid Midsegment Properties

##### GeometryPolygons

How to define the midsegment of a trapezoid, calculate its length, and relate it to a triangle midsegment.

midsegment trapezoid average bases midpoint