Grades 6-8 Fcat 2.0 Mathematics Reference Sheet Page 14
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20Objective: Identify and compare the relationship between the parts of a circle using radius, diameter,
and circumference (pi = 3.14).
r = ½ d
The radius of a circle is ½ the length of the diameter.
d = 2r
The diameter of a circle is 2 times the length of the radius.
C = d
The circumference of a circle is found by multiplying the diameter by pi (3.14).
The circumference of a circle can also be found by multiplying 2 times the radius by pi (3.14).
C = 2r
Examples:
diameter RT = 4 cm
radius ST = ½ x 4cm = 2cm
radius SR = 2 cm
diameter RT = 2 x 2cm = 4 cm
S
R
T
C = d
C = 3.14 x 4cm
C = 12.56cm
C = 2r
C = 2 x 3.14 x 2cm
C = 6.28 x 2cm
C = 12.56cm
1.) Given a circle with a radius of 7 cm:
2.) Give a circle with a diameter of 18 inches:
Determine the diameter: __________
Determine the radius: __________
Determine the circumference: __________
Determine the circumference: __________
3.) Draw a line from each part of a circle to it’s
4.) Fill in the blanks:
measurement:
The _______________ is twice the length of the
31.4 cm
radius
_______________.
The _______________ is 3.14 times the _______________.
5 cm
diameter
The _______________ is half the length of the
_______________.
10 cm
circumference
5.) Jose is helping his mom make a circular flower bed.
6.) Rebecca is painting huge circles on her bedroom walls!
The diameter of the flower bed is 12 feet. How much
She wants one of the circles to be ½ purple and ½ yellow.
fencing will they need to buy for the circumference of the
The diameter of the circle is 121 inches. She tells her dad to
flower bed? Please show your work.
measure 61 inches from the edge of the circle to find the
middle of the circle. Is this correct? Please explain your
answer with math. ☺
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