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To calculate the area of a circle in QBasic, you can use the formula Area = π * r², where r is the radius. First, prompt the user to enter the radius, then use the SQR function to compute the square of the radius. Finally, multiply the squared radius by the constant value of π (you can use 3.14159) and display the result. Here's a simple code snippet:

INPUT "Enter the radius: ", r
area = 3.14159 * (r ^ 2)
PRINT "The area of the circle is "; area
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2w ago

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