# concentric circles   68 videos

• #### Percent Concentrations

##### AlgebraWord Problems Using Systems of Equations

How to solve word problems about mixing two liquids with different percent concentrations.

percent concentration mixture
• #### The Circle

##### Algebra 2Conic Sections

How to use the distance formula to derive the equation for a circle.

circle center radius distance formula equation for a circle
• #### The Circle

##### PrecalculusConic Sections

How to use the distance formula to derive the equation for a circle.

circle center radius distance formula equation for a circle
• #### The Circle

##### PrecalculusEquations of Lines, Parabolas and Circles

How to use the distance formula to derive the equation for a circle.

circle center radius distance formula equation for a circle
• #### Parts of a Circle

##### GeometryGeometry Building Blocks

How to define a circle and identify its main parts.

center chord diameter radius congruent circles concentric circles arc minor arc major arc semicircle central angle
• #### Area of Circles

##### GeometryArea

How to derive the formula to calculate the area of a circle.

• #### Equation of a Circle

##### GeometryPythagorean Theorem

How to derive the equation for a circle using the distance formula.

• #### Equation of a Circle

##### TrigonometryPythagorean Theorem

How to derive the equation for a circle using the distance formula.

• #### Parametrizing a Circle

##### PrecalculusVectors and Parametric Equations

How to write the parametric equations of a circle centered at (0,0) with radius r, oriented counter-clockwise.

the unit circle cosine sine parametrization parametric equations circle counter clockwise
• #### Regions Between Circles and Squares

##### GeometryArea

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

• #### Tangent Segments to a Circle

##### GeometryCircles

How to find the length of tangent segments drawn to a circle from the same point.

tangent congruent segments inscribed circle
• #### Locus and Definition of a Circle and Sphere

##### GeometryCircles

How to define a circle and a sphere using the word locus.

locus set of points distance plane circle sphere given
• #### Circumscribed and Inscribed Circles and Polygons

##### GeometryConstructions

How to define circumscribed and inscribed circles and polygons relative to each other.

vertex radius polygon inscribed circle circumscribed
• #### pH and pOH

##### ChemistryAcids and Bases

How pH and pOH represent the concentration.

pH pOH acid base concentration
• #### Circle Tic Tac Toe Fun

How to beat your teacher at circle tac tac toe.

games fun math circle tic tac toe
• #### Area and Perimeter of Circles

##### Pre-AlgebraIntroductory Geometry

Vocabulary and formulas for the area of a circle

• #### Calculating Coordinates in the Unit Circle

##### GeometryPythagorean Theorem

How to describe the unit circle. How to draw the unit circle and label its parts. How to strategize about finding coordinates on the unit circle.

graphing a rational expression 1/x asymptotes
• #### Calculating Coordinates in the Unit Circle

##### TrigonometryPythagorean Theorem

How to describe the unit circle. How to draw the unit circle and label its parts. How to strategize about finding coordinates on the unit circle.

graphing a rational expression 1/x asymptotes
• #### Similar Triangles in Circles and Right Triangles

##### GeometrySimilarity

How to determine if two triangles in a circle are similar and how to prove that three similar triangles exist in a right triangle with an altitude.

similar inscribed angles intercepted arc right angle circle
• #### Chords and a Circle's Center

##### GeometryCircles

How to define a chord; how to describe the effect of a perpendicular bisector of a chord and the distance from the center of the circle.

chord perpendicular bisector distance from the center congruent chords