Question

what is π, r

pls answer I am new to this topic
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Answer 1

•  π :  pi—which is written as the Greek letter for p, or π—is the ratio of the circumference of any circle to the diameter of that circle. Regardless of the circle's size, this ratio will always equal pi. In decimal form, the value of pi is approximately 3.14...

• r : The typical abbreviation and mathematical variable name for radius is r. By extension, the diameter d is defined as twice the radius: If an object does not have a center, the term may refer to its circumradius, the radius of its circumscribed circle or circumscribed sphere...

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Answer 2

Answer:

this is is called Pie r is used for finding the area of circles