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Circumference of a circle given radius
All Geometry math games
Area of triangle
Identify side of triangle given area
Area of quadrilateral
Identify side of quadrilateral given area
Area of circle given radius
Area of circle given circumference
Circumference of a circle given radius
Radius of a circle given circumference
Volume of sphere, cone, cylinder
Volume of cuboid
What is the circumference of the circle, if the radius is
5
?
10π
25
5π
10
Skip
Hint
Can you answer 10 correctly?
The circumference of the circle is
?
Circumference
=
2
π
radius
The circumference of a circle is the length of the outer edge of the circle. It is calculated by the equation
2πr
π
(spelled pi, but pronounced like a slice of pie) is the constant value of 3.14159...
r
equals the length of the radius of the circle, which is the length from the center of the circle to any edge
For example, if the radius of a circle is 4 inches
Multiply the radius by 2, which is 2 x 4 inches, or 8 inches
Multiply that by π, which is 8π, or approximately 25.13 inches
Strategies:
Area Model
,
Matrix Model