It means a rotation of pi radians (180 degrees).
principal(in terms of math)- the amount you borrow or deposit
HL in math mean hypotenuse leg
It
Solution is a fancy word for "answer" haa so basically its asking is blank the answer? ex. Find the Solution Find the Answer Both same thing
ask your math teacher
sum means the answer of a math problem
No.
A number? ^^
Milimeters
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