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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Top Circles Worksheets
circles, curves, plane figures, radius, shapes, circumference, .
Finding Equation Of A Circle By Completing The Square 2 Video Clip
Finding Equation Of A Circle By Completing The Square 2
Video Clip Length: 6 minutes 5 seconds
Video Clip Views: 43612
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
Area Of a Circle When Diameter is Given
Video Clip Length: 5 minutes 9 seconds
Video Clip Views: 37983
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
Finding The Center And Radius Of A Circle By Completing The Square
Video Clip Length: 5 minutes 29 seconds
Video Clip Views: 34418
center, circles, completing the square, curves, equations, plane figures, quadratic equations, radius, shapes, solving equations, solving quadratic equations
Finding Equation Of A Circle By Completing The Square Video Clip
Finding Equation Of A Circle By Completing The Square
Video Clip Length: 5 minutes 42 seconds
Video Clip Views: 26951
circle equation, circles, completing the square, curves, equations, plane figures, quadratic equations, shapes, solving equations, solving quadratic equations
Finding Equation Of A Circle By Completing The Square 3 Video Clip
Finding Equation Of A Circle By Completing The Square 3
Video Clip Length: 3 minutes 29 seconds
Video Clip Views: 25806
circle equation, circles, completing the square, curves, equations, plane figures, quadratic equations, shapes, solving equations, solving quadratic equations
Finding The Equation Of A Circle Given Diameter Video Clip
Circumference Of A Circle When Diameter is Given Video Clip
Circumference Of A Circle When Diameter is Given
Video Clip Length: 1 minute 40 seconds
Video Clip Views: 22118
This tutorial will show you how to find the circumference when given the diameter. You will also learn how to multiply by decimals and multiply by pi. We realize that pi is an approximation and use 3.14 as a substitution into the circumference formula.
circles, circumference, curves, diameter, plane figures, shapes
Finding Equation Of A Circle Video Clip
Finding Equation Of A Circle
Video Clip Length: 2 minutes 14 seconds
Video Clip Views: 21547
circle equation, circles, curves, equations, plane figures, shapes
Circumference Of a Circle When Radius is Given Video Clip
Circumference Of a Circle When Radius is Given
Video Clip Length: 3 minutes 20 seconds
Video Clip Views: 19645
This tutorial will show you how to find the circumference when given the radius. You will learn the relationship between the diameter and the radius. It is important to take note that we need to replace the diameter in the formula and not the radius, so we need to take the measurement for the radius and figure out the diameter in order to solve for the circumference.
circles, circumference, curves, plane figures, radius, shapes
Finding Equation Of A Circle 2 Video Clip
Finding Equation Of A Circle 2
Video Clip Length: 2 minutes 13 seconds
Video Clip Views: 18414
circle equation, circles, curves, equations, plane figures, shapes
Top Circles Word Problems

A birthday present is packaged in a tube (#1683)
A birthday present is packaged in a tube... ...uch paper is needed to wrap the present?
area, circles, circumference, curves, cylinders, plane figures, shapes, solid figures, surface area

A circle with radius 5 (#261)
A circle with radius 5 has its center at... ...sects the circle. find the intersections
circle equation, circles, curves, equations, plane figures, shapes

The volume of the soda can (#1671)
The volume of the soda can is fixed at 4... ...2 cm, 3 cm, 4 cm, 5 cm, 6 cm, 7 cm, 8cm.
area, circles, curves, cylinders, plane figures, shapes, solid figures, surface area, volume

A large pizza has a diameter (#3431)
A large pizza has a diameter 35cm. Two l... ...deal: 2 large pizzas or 3 medium pizzas?
area, area of circles, circles, curves, plane figures, radius, shapes

What is the surface area (#2150)
What is the surface area of a cylinder t... ...that is 4 foot radius and 35 feet long?
area, circles, circumference, curves, cylinders, plane figures, shapes, solid figures, surface area
See All Circles Word Problems
Homework Help Questions
 What is the circumference and area if the radius of a circle is 23cm?
 What is the radius?
 Area = 28 in. sq.
Diamiter = ?
 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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Hundreds of video clips, worksheets, and word problems on radius.
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Hundreds of video clips, worksheets, and word problems on area of circles.
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