The symbol that you describe seems to be the greek letter Phi. It is normally used to indicate a variable that is an angle, just as x is used to indicate a variable that is a numeric quantity.
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The quadrant is the one of the four quaters of a circle. It is the math term for a 1/4 of a circle.
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What is a Variable in Math?A variable in math is part of algebra and it is a symbol or letter that represents a number.
The answer is an equal sign =
A radius is a line drawn from the centre of a circle to the edge of that circle. It is half the length of the diameter of the circle.