Yes. To name a few: Radius (the distance from the center of a circle to the edge) Rate (a percent representing interest in finances) Reflexive property (a=a) Reflection ("flipping" a shape across a line)
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nCr=n!/r!/(n-r)!
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)
9r-- think of the 'r' as '1r' and add like you normally would.
Geometric Sequences work like this. You start out with some variable x. Your multiplication distance between terms is r. Your second term would come out to x*r, your third x*r*r, and so on. If there are n terms in the sequence, your final term will be x*r^(n-1).
nCr=n!/(r!(n-r)!)