A formula that expresses D in terms of r and s is D = πr² - s²
What is the area of the circle?
A = π × r²
where r is the radius of the circle
What is the area of the square?
A = a²
where 'a' represents the side length of the square
For given example,
A circle has a varying radius of 'r' inches and a square has a varying side length of 's' inches.
Area of circle would be,
⇒ A = πr² square inches
Also, the area of the square would be,
⇒ A = s² square inches
Let D represent how much greater the area of the circle is than the area of the square (in square inches).
⇒ D = πr² - s²
Therefore, a formula that expresses D in terms of r and s is D = πr² - s²
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