# area of a triangle   115 videos

• #### Why SSA and AAA Don't Work as Congruence Shortcuts

##### GeometryTriangles

How to determine which congruence shortcuts do not work and why.

congruent triangles shortcuts
• #### The Law of Sines

##### GeometryBasic Trigonometry

How to define the law of sines.

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

##### GeometryBasic Trigonometry

How to define and use the law of cosines.

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

##### TrigonometryBasic Trigonometry

How to define the law of sines.

law of sines ratios triangles
• #### 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
• #### Regions Between Circles and Squares

##### GeometryArea

How to calculate the area between a square and an inscribed circle.

• #### 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
• #### 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
• #### Pressure

##### PhysicsHeat and Thermodynamics

Understanding the concept of pressure.

pressure force surface area air pressure
• #### Volume of Pyramids

##### GeometryVolume

How to find the volume of any pyramid.

volume base area height pyramid regular polygon
• #### 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
• #### 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
• #### 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