Severity: Warning

Message: count(): Parameter must be an array or an object that implements Countable

Filename: controllers/calculator.php

Line Number: 37

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Given is the radius of the circle, r = 6 centimeters

Circumference of the circle, C = 2 * π * (6)

‘π’ is a constant value and the value of it is è

Circumference of the circle, C = 2 * (3.14) * (6)