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The radius of a circle is 3.5 cm, find its circumference and area.
Radius = 3.5 cm
Circumference = 2πr
2 × 22/7 × 3.5 = 22 cm
Area = πr²
= 22/7 × 3.5 × 3.5
= 77/2 = 38.5 cm²