Answer:346.5
Step-by-step explanation: At first,we have calculate the radius of the given circle,by using the following mathematical formula.
Radius = Diameter/2 = 21/2 = 10.5 cm
Now,we have to calculate the area of the circle by using the following mathematical formula,
Area of the circle = π×r² = 22/7 × 10.5 × 10.5 = 346.5 cm²
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