No. 2Pi r is equal to Pi d, though.
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It should be called the fourth of a circle. Numerically, it's (2pi x r)/4 for the perimeter. and (pi x r squared) / 4 for the area.
Here are the three circle equations, in words and equations. Circumfwerence - pi X diameter C = pi d Circumference = two X pi X radius C = 2pi r Area = pi X radius squared A = pi r^(2) NB It is only the radial value that is squared ; NOT 'pi'. NB pi is a constant at 3.141592..., usually approximated to 3.14 or 3.1416.
C = 2(pi)r 8cm=2(pi)r (8cm)/2pi = r d=2r d=8cm/pi
Pi times r times r or Pi r squared is the formula for finding the area of a circle where r is the radius
volume of a circle