The area of a circle that has diameter of 3 cm is: 7.069 cm2
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3.4 cm to 3 dp.
Area = pi*6.42 = 128.679 square cm to 3 dp
Area = pi*72 = 153.938 square cm to 3 decimal places
Area = pi*0.72 = 1.539 square cm to 3 decimal places
area = pi*31.52 = 3117.245 square cm to 3 decimal places