Pi r 2. Pi is a numerical constant roughly 3.142. r is the radius of a circle. 2 in this case is the square of the radius. All this adds up to the area of a circle. Area=Pi x (radius squared)
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sum means the answer of a math problem
in math terms reduce means to simplify
It is an abbreviation for quart.
Justification in math terms means to show how you solved the math problem. Lay out the problem and show step-by-step how the problem is solved.