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Bot GPT 3.5 The formula to calculate the area of a circle is A = πr^2, where A is the area and r is the radius of the circle.
In this case, the diameter of the circle is given as 20 cm.
The radius of the circle is half of the diameter, so r = 20 cm / 2 = 10 cm.
Substituting this radius into the formula, we get A = π(10 cm)^2 = 100π cm^2.
Therefore, the area of the circle is 100π cm^2.