Geometry: Circles Help

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Geometry: Circles

Circles are simple shapes of Euclidean geometry. A circle consists of those points in a plane which are at a constant distance, called the radius, from a fixed point, called the center.

A chord of a circle is a line segment whose both endpoints lie on the circle. A diameter is a chord passing through the center. The length of a diameter is twice the radius. A diameter is the largest chord in a circle.

Circles are simple closed curves which divide the plane into an interior and an exterior. The circumference of a circle is the perimeter of the circle, and the interior of the circle is called a disk. An arc is any connected part of a circle.

A circle is a special ellipse in which the two foci are coincident. Circles are conic sections attained when a right circular cone is intersected with a plane perpendicular to the axis of the cone.
 
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At TuLyn, we have over 2000 math video tutorial clips including circles videos, circles practice word problems, circles questions and answers, and circles worksheets.

Our circles videos replace text-based tutorials and give you better step-by-step explanations of circles. Watch each video repeatedly until you understand how to approach circles problems and how to solve them.
  • Hundreds of video tutorials on circles make it easy for you to better understand the concept.
  • Hundreds of word problems on circles give you all the practice you need.
  • Hundreds of printable worksheets on circles let you practice what you have learned by watching the video tutorials.
How to do better on circles: TuLyn makes circles easy.

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Geometry: Circles Videos

Finding Equation Of A Circle By Completing The Square 2
Video Clip Length: 6 minutes 5 seconds
Video Clip Views: 31411

circle equation, circles, completing the square, curves, equations, plane figures, quadratic equations, shapes, solving equations, solving quadratic equations
Area Of a Circle When Diameter is Given
Video Clip Length: 5 minutes 9 seconds
Video Clip Views: 29176

This tutorial will teach you how to find the area of a circle when given the diameter.  You will also learn how to use given information, the diameter, and figure out what the radius will be equivalent to in order to solve for the area.  You also learn to multiply decimals with various decimal places.

area, area of circles, circles, curves, diameter, plane figures, shapes
Finding The Center And Radius Of A Circle By Completing The Square
Video Clip Length: 5 minutes 29 seconds
Video Clip Views: 25010

center, circles, completing the square, curves, equations, plane figures, quadratic equations, radius, shapes, solving equations, solving quadratic equations
See All Circles Video Tutorials

Geometry: Circles Worksheets

See All Circles Worksheets

Geometry: Circles Word Problems

A birthday present is packaged in a tube
A birthday present is packaged in a tube that has a length of 10 inches and a diameter of 4 ...
A circle with radius 5
A circle with radius 5 has its center at (4,1). the line x-2y+4=0 intersects the circle. find the intersections
The volume of the soda can
The volume of the soda can is fixed at 400 cubic centimeters. Use the volume with each radius to find the possible heights of different sized soda cans. Once the height column is completed calculate the surface areas. The results for radius are already given. Round the height to the nearest tenth and the surface area to the nearest whole number. The given radius are: 1 cm, 2 cm, 3 cm, 4 cm, 5 cm, 6 cm, 7 ...
See All Circles Worksheets

Geometry: Circles Practice Questions

What is the circumference and area if the radius of a circle is 23cm?
What is the radius?
Area = 28 in. ...
What is the circumference of a circle with a diameter of 18cm?
how do you find the area of a circle if the diameter is 4 1/2?

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This Geometry page lists video tutorials, worksheets and word problems on circles topic.