Measurements Of Polygons And Circles Worksheets - Lance Mangham, 6th Grade Math, Carroll Isd Page 25
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40CIRCLES
Important information about circles:
• The diameter is exactly twice the radius.
• The radius is exactly half of the diameter.
π
π
is a number that goes on forever.
represents how many diameters it takes to go around the
•
circumference of any circle.
RADIUS
DIAMETER
DIAMETER to RADIUS
RADIUS to DIAMETER
***** DIVIDE BY 2 *****
***** MULTIPLY BY 2 *****
If radius = 5, then the diameter = 10.
If diameter = 14, then the radius = 7.
DIAMETER TO CIRCUMFERENCE
RADIUS TO CIRCUMFERENCE
***** MULTIPLY BY
π
*****
***** MULTIPLY BY 2
π
*****
If the diameter of this circle is 6,
If the radius of this circle is 9,
π
C
=
d
2
π
C
=
r
3.14 6
C
=
•
2 3.14 9
C
= •
•
C
=
18.84
=
56.52
C
CIRCUMFERENCE TO RADIUS
CIRCUMFERENCE TO DIAMETER
***** DIVIDE BY 2
π
*****
π
***** DIVIDE BY
*****
If the circumference of this circle is 18.84,
If the circumference of this circle is 15,
2
π
C
=
r
π
C
=
d
18.84 2 3.14
= •
•
r
15.7 3.14
=
d
18.84 6.28
=
r
15.7
=
d
18.84
3.14
=
r
6.28
5
=
d
3
=
r
th
Created by Lance Mangham, 6
grade math, Carroll ISD
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