103 Videos for "radius"

Surface Area of Spheres  Problem 1
Math › Geometry › Volume
How to calculate the surface area of a hemisphere. 
The Circle  Concept
Math › Precalculus › Equations of Lines, Parabolas and Circles
How to use the distance formula to derive the equation for a circle. 
Volume of Cones  Problem 1
Math › Geometry › Volume
How to find the height of a cone, given the radius and the height. 
Radian Measure of Angles  Problem 1
Math › Trigonometry › Trigonometric Functions
How to measure a central angle of a circle when the radius and the length of the intercepted arc are given. 
Radian Measure of Angles  Problem 1
Math › Precalculus › Trigonometric Functions
How to measure a central angle of a circle when the radius and the length of the intercepted arc are given. 
Circumscribed and Inscribed Circles and Polygons  Concept
Math › Geometry › Constructions
How to define circumscribed and inscribed circles and polygons relative to each other. 
Radii to Tangents  Problem 2
Math › Geometry › Circles
How to calculate a missing angle in a quadrilateral formed by two circles that are tangent but not congruent and their radii drawn to a common line of tangency. 
Regions Between Circles and Squares  Problem 2
Math › Geometry › Area
How to calculate the area of a region formed by four quarter circles inside a square. 
Radii to Tangents  Problem 3
Math › Geometry › Circles
How to calculate the length of a segment drawn from the center of a circle to a point outside the circle, given the length of the tangent segment to that circle. 
Chords and a Circle's Center  Problem 3
Math › Geometry › Circles
How to find the radius of a circle when the length of a chord and its distance to the center of the circle is given. 
Parametrizing a Circle  Concept
Math › Precalculus › Vectors and Parametric Equations
How to write the parametric equations of a circle centered at (0,0) with radius r, oriented counterclockwise. 
Parametrizing a Circle  Problem 1
Math › Precalculus › Vectors and Parametric Equations
How to find parametric equations of a semicircle centered at (0,0) with radius 12, oriented counterclockwise. 
Parametrizing a Circle  Problem 3
Math › Precalculus › Vectors and Parametric Equations
How to write the parametric equations of a circle or semicircle centered at (0,0) with radius r, oriented clockwise. 
Parts of a Circle  Problem 1
Math › Geometry › Geometry Building Blocks
How to classify arcs and define chords and tangents. 
Parts of a Circle  Concept
Math › Geometry › Geometry Building Blocks
How to define a circle and identify its main parts. 
Parametrizing a Circle  Problem 2
Math › Precalculus › Vectors and Parametric Equations
How to find parametric equations of a circle centered at (3,4) with radius 5, oriented counterclockwise. 
Central Angles and Intercepted Arcs  Problem 2
Math › Geometry › Circles
How to find the arc and angle measure when a diameter is given, as well as a radius and a chord drawn between the two. 
Using Sine to Calculate the Area of a Triangle  Problem 2
Math › Precalculus › Basic Trigonometry
How to calculate the area of a regular inscribed polygon given only the radius of a circle. 
Using Sine to Calculate the Area of a Triangle  Problem 2
Math › Trigonometry › Basic Trigonometry
How to calculate the area of a regular inscribed polygon given only the radius of a circle. 
Regions Between Circles and Squares  Problem 1
Math › Geometry › Area
How to calculate the area of a region formed by four circles inside a square.