TT in this case is standing in for the greek letter pi (π)
TTr2 means "Pi times the radius squared" and is the equation for calculating the area of a circle.
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Sides on a Rectangle (or Rhombus)
I
r=0,Tr-r = 0 = r(T-1), since T != 1, then T-1 is non zero so r must be zero.
6
pq-r, if p is 3, q is 4, and r is -6 is equal to 3 x 4 - (-6), which is equal to 12 + 6, which is equal to 18.