To get the area you would divide the diameter 3.4 into 2 =1.7 Then pi, a=3.14x1.7 x1.7=9.0746 For your circumfrence? C=2x3.14x1.7=10.676
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34 pi cm = 106.8 cm
Diameter of the circle: 34/pi = 10.823 cm rounded
The circumference and area of a 21.5 cm diameter circle are:C = 67.54 cmA = 363.1 cm2
Area = pi*72 square cm Circumference = pi*14 cm
Its circumference is: 15*pi cm Its area is: pi*7.5^2 square cm