Practical usage of formulas in JavaScript

Let the variable r with the radius of the circle be given. Using the appropriate formula, find the area of the circle and write it to the variable s. Print the contents of this variable to the screen.

Let the variable a with the side of a square be given. Find the area of the square and write it to the variable s. Print the contents of this variable to the screen.

Let the variables a and b with the sides of a rectangle be given. Find the area of the rectangle and write it down in the variable s. Print the contents of this variable to the screen.

Let the variables a and b with the sides of a rectangle be given. Find the perimeter of the rectangle and write it to the variable p. Print the contents of this variable to the screen.

Let the variable tc with the temperature in degrees Celsius be given. Use the appropriate formula to convert this temperature to degrees Fahrenheit.

Let the variable tf with the temperature in degrees Fahrenheit be given. Using the appropriate formula, to convert this temperature to degrees Celsius.

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