Radius, diameter, & circumference | Circles (article) - Khan Academy
Learn the relationship between the radius, diameter, and circumference of a circle.
Circles | Geometry (all content) | Math | Khan Academy
Standard equation of a circle Learn Features of a circle from its standard equation Graphing a circle from its standard equation
Radius, diameter, circumference & π (video) | Khan Academy
Learn how the number Pi allows us to relate the radius, diameter, and circumference of a circle.
Area of a circle (article) | Khan Academy
How can we find the area of a circle when it doesn't split neatly into unit squares? Let's rearrange a circle to make it easier to find its area.
Circle equation review | Analytic geometry (article) | Khan Academy
Review the standard and expanded forms of circle equations, and solve problems concerning them.
Area of a circle (video) | Geometry | Khan Academy
The area of a circle is pi times the radius squared (A = π r²). Learn how to use this formula to find the area of a circle when given the diameter.
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Writing standard equation of a circle - Khan Academy
Use the distance formula to find the length of the diameter, and then divide by 2 to get the radius. Then find the midpoint of the diameter which will be the center of the circle.
Circumference review (article) | Geometry | Khan Academy
Course: 7th grade math > Unit 9 Lesson 1: Area and circumference of circles Geometry FAQ Radius, diameter, circumference & π Labeling parts of a circle Radius, diameter, & circumference Radius and …
Circle equations | Lesson (article) | Khan Academy
What are circle equations, and how frequently do they appear on the test? We can describe circles in the x y -plane using equations in terms of x and y . Circle equations questions require us to …