Circles: Circumference and Perimeter SACHS
Calculate the circumference correct to 2 decimal places.
C = 2πr
=
= 2 x π x
cm
Radius =
cm
Calculate the circumference correct to 2 decimal places.
C = πd 
= π x
=
Diameter =
cm
cm
Perimeter = θ / 360 x πd + line
Calculate the perimeter correct
to the nearest whole number.
= 360 x π x
=
cm
Diameter =
+
cm
Perimeter = θ / 360 x 2πr + 2 lines
Calculate the perimeter correctto the nearest whole number.
= 360 x 2 x π x
=
mm
+
Radius =
+
mm
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