• #### Surface Area of Spheres - Problem 3

##### Math›Geometry›Volume
How to calculate the radius of a sphere given a radius.
• #### The Midpoint and Distance Formulas in 3D - Problem 4

##### Math›Precalculus›Vectors and Parametric Equations
How to find the center and radius of a sphere when its equation is not in center-radius form by completing the square.
• #### Circumference - Problem 2

##### Math›Geometry›Circles
How to find the radius of a circle given circumference.
• #### The Circle - Problem 1

##### Math›Precalculus›Conic Sections
How to find the equation for a circle given the center and radius.
• #### Circumference - Problem 1

##### Math›Geometry›Circles
How to calculate the circumference of a circle given diameter or radius.
• #### Radii to Tangents - Concept

##### Math›Geometry›Circles
How to define a tangent line; how to determine the angle a radius to a tangent forms.
• #### The Circle - Problem 1

##### Math›Algebra 2›Conic Sections
How to find the equation for a circle given the center and radius.
• #### Surface Area of Spheres - Concept

##### Math›Geometry›Volume
How to calculate the surface area of a sphere given a radius.
• #### The Circle - Problem 3

##### Math›Precalculus›Conic Sections
How to find the center and radius of a circle by completing the square.
• #### The Circle - Problem 3

##### Math›Algebra 2›Conic Sections
How to find the center and radius of a circle by completing the square.
• #### Area of an Annulus - Problem 3

##### Math›Geometry›Area
How to find the distance between two circles given the area of the annulus and the radius of the smaller circle.
• #### Arc Length - Problem 1

##### Math›Geometry›Circles
How to find the length of an arc given a radius and arc length.
• #### The Circle - Problem 3

##### Math›Precalculus›Equations of Lines, Parabolas and Circles
How to find the center and radius of a circle by completing the square.
• #### Area of a Sector - Problem 1

##### Math›Geometry›Area
How to find the area of a sector when the radius and arc measure are given.
• #### Area of an Annulus - Problem 1

##### Math›Geometry›Area
How to calculate the area between two circles, given the radius of the smaller circle and the distance between the circles.
• #### The Circle - Problem 1

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

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

##### Math›Trigonometry›Pythagorean Theorem
How to identify the center and radius of a circle given an equation.
• #### Arc Length - Problem 2

##### Math›Geometry›Circles
How to find the radius of a circle given arc length and arc measure.
• #### Area of an Annulus - Problem 2

##### Math›Geometry›Area
How to calculate the area between two circles, given the radius of the smaller circle and the distance between the circles.
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