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.

• Finding Degree Measurement From Fractional Part Of Circle
  53 seconds
  
  circles, curves, degree, fractions, geometry, math, number sense, numbers, plane figures, shapes
• Finding Equation Of A Circle By Completing The Square 2
  6 minutes 5 seconds
  
  circle equation, circles, completing the square, curves, equations, geometry, plane figures, quadratic equations, shapes, solving equations, solving quadratic equations
• Area Of a Circle When Diameter is Given
  5 minutes 9 seconds
  
  area, arithmetic, arithmetic operations, circles, curves, decimals, diameter, exponents, geometry, multiplication, multiplication of decimals, multiplying decimals, number sense, operations, operations with decimals, plane figures, radius, shapes
• Circumference Of A Circle When Diameter is Given
  1 minute 40 seconds
  
  circles, circumference, curves, diameter, geometry, plane figures, shapes
• Circumference Of a Circle When Radius is Given
  3 minutes 20 seconds
  
  circles, circumference, curves, diameter, geometry, plane figures, radius, shapes
• Finding Equation Of A Circle By Completing The Square
  5 minutes 42 seconds
  
  circle equation, circles, completing the square, curves, equations, geometry, plane figures, quadratic equations, shapes, solving equations, solving quadratic equations
• Finding The Center And Radius Of A Circle By Completing The Square
  5 minutes 29 seconds
  
  center, circles, completing the square, curves, equations, geometry, math, plane figures, quadratic equations, radius, shapes, solving equations, solving quadratic equations
• Finding Equation Of A Circle By Completing The Square 3
  3 minutes 29 seconds
  
  circle equation, circles, completing the square, curves, equations, geometry, plane figures, quadratic equations, shapes, solving equations, solving quadratic equations
• Finding Equation Of A Circle
  2 minutes 14 seconds
  
  circle equation, circles, curves, equations, geometry, plane figures, shapes
• Finding Degree Measurement From Fractional Part Of Circle 2
  60 seconds
  
  circles, curves, degree, fractions, geometry, math, number sense, numbers, plane figures, shapes

See All Circles Videos

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• circumference 1
  
• circumference 2
  
• circumference 3
  

See All Circles Worksheets

circles, circumference, curves, geometry, plane figures, shapes, .

• Problem 1:
  Sarah had an idea, what would happen if you put a golf ball inside a basketball? How much room would there be inside the basketball afterwards. Her golf ball has a radius of 1.68 inches while her basketball has a diameter of 9.4 inches. How much space will be left over after the golf ball is placed inside the basketball?
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  (circle equation word problems, circles word problems, curves word problems, equations word problems, plane figures word problems, shapes word problems)
• Problem 2:
  Two satellites are orbiting earth. The path of one has the equation x2 +y2 = 2250000. The orbit of the other is 200 km farther fro the centre of earth. In one orbit, how much farther does the second satellite travel than the first one?
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  (circle equation word problems, circles word problems, curves word problems, equations word problems, plane figures word problems, shapes word problems)
• Problem 3:
  a circle with radius 5 has its center at (4,1). the line x-2y+4=0 intersects the circle. find the intersections
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  (circle equation word problems, circles word problems, curves word problems, equations word problems, plane figures word problems, shapes word problems)

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