• #### Equation of a Circle - Problem 2

##### Math›Geometry›Pythagorean Theorem
How to identify the center and radius of a circle given an equation.
• #### The Circle - Problem 2

##### Math›Algebra 2›Conic Sections
How to find the center and radius of a circle given an equation.
• #### The Circle - Problem 2

##### Math›Precalculus›Equations of Lines, Parabolas and Circles
How to find the center and radius of a circle given an equation.
• #### Area of a Sector - Problem 2

##### Math›Geometry›Area
How to find the radius of a circle when the area and arc measure are given.
• #### The Distance Formula in Polar Coordinates - Problem 3

##### Math›Precalculus›Polar Coordinates and Complex Numbers
How to derive the polar equation of a circle given its center and radius.
• #### The Midpoint and Distance Formulas in 3D - Problem 2

##### Math›Precalculus›Vectors and Parametric Equations
How to find the equation of a sphere with center (a,b,c) and radius r.
• #### Introduction to the 3D Coordinate System - Problem 2

##### Math›Precalculus›Vectors and Parametric Equations
How to find the equation of a sphere with radius r when it is centered at the origin.
• #### Using the Pythagorean Theorem to find a Missing Hypotenuse - Problem 4

##### Math›Geometry›Pythagorean Theorem
How to find the radius of a circle centered at the origin, given the (x, y) coordinates of a point on the circle.
• #### Using the Pythagorean Theorem to find a Missing Hypotenuse - Problem 4

##### Math›Trigonometry›Pythagorean Theorem
How to find the radius of a circle centered at the origin, given the (x, y) coordinates of a point on the circle.

• #### The Ellipse - Problem 4

##### Math›Algebra 2›Conic Sections
How to find the equation of an ellipse by completing the square.
• #### The Ellipse - Problem 2

##### Math›Algebra 2›Conic Sections
How to transform the graph of a transformed ellipse and find vertices.
• #### The Ellipse - Problem 1

##### Math›Precalculus›Conic Sections
How to find the equation of an ellipse centered at the origin.
• #### The Ellipse - Problem 2

##### Math›Precalculus›Conic Sections
How to transform the graph of a transformed ellipse and find vertices.
• #### The Ellipse - Problem 3

##### Math›Precalculus›Conic Sections
How to find the equation of an ellipse given co-vertices and foci.
• #### The Ellipse - Problem 4

##### Math›Precalculus›Conic Sections
How to find the equation of an ellipse by completing the square.
• #### The Ellipse - Problem 3

##### Math›Algebra 2›Conic Sections
How to find the equation of an ellipse given co-vertices and foci.
• #### The Ellipse - Problem 1

##### Math›Algebra 2›Conic Sections
How to find the equation of an ellipse centered at the origin.