A lower case "r."
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The raduis.It's pi, r squared. the r stands for radius!
It refers to the radius of a circle which is half of its diameter.
radius is half of a circle. when u make a line from the middle of the circle to the edge would be the radius:]
When you draw a circle in math, and you draw a triangle inside of it, 2 of the lines should be the radius of the circle, and the third (bottom) line that is not the radius is the chord.
Oh, dude, in math, a symbol that represents a quantity is called a variable. It's like a mysterious letter that stands in for a number, kinda like a math magician pulling numbers out of a hat. So, next time you see a letter in a math problem, just remember it's not trying to confuse you, it's just playing the math game.