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me, the main dish (pièce de résistance : the hard part, which will resist the most)
Pièce de résistance (in a meal) is more comonly called "le plat" or "le plat principal".
Gustave Eiffel has written:
'La re sistance de l'air et l'aviation..'
Pi times r times r or Pi r squared is the formula for finding the area of a circle where r is the radius
C = 2*pi*r
8 = 2*pi*r
4 = pi*r
r = 4/pi