Standard equation of a circle Learn Features of a circle from its standard equation Graphing a circle from its standard equation

Learn Geometric constructions: circle-inscribed square Geometric constructions: circle-inscribed equilateral triangle Geometric constructions: circle-inscribed regular hexagon

Learn the relationship between the radius, diameter, and circumference of a circle.

The standard form equation of a circle contains the squares of two binomials. Sometimes, we'll be asked to determine the center or radius of a circle represented by an equation in which the squares of the …

Because all radii of a circle are congruent, triangles with those radii as sides must be isosceles. We'll use that fact to prove an important relationship between central angles and inscribed angles on the …

For each point on the unit circle, select the angle that corresponds to it. Click each dot on the image to select an answer.

Remember, the circle itself is all of the points that are equal distance from the center. So AB, any line segment, I should say, that connects the center to a point on the circle, we would call a radius.

Review the standard and expanded forms of circle equations, and solve problems concerning them.

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. Created by Sal Khan and Monterey Institute for Technology …

Learn how to use the unit circle to define sine, cosine, and tangent for all real numbers.