Asmall silver dollar pancakes served at a restaurant has a circumference of two pi inches a regular pancake has a circumference of four pi inches is the area of the regular pancake twice the area of the silver dollar pancakes

For this case we have that the perimeter by definition is:
 P = 2 * pi * r
 For small silver dollar pancakes:
 2 * pi * r = 2 * pi
 Thus:
 r = 1
 For a regular pancake 
 2 * pi * r = 4 * pi
 Thus:
 r = 2
 The area of both will be:
 For small silver dollar pancakes:
 A1 = pi * r1 ^ 2
 A1 = pi * (1) ^ 2
 A1 = pi
 For a regular pancake 
 A1 = pi * r2 ^ 2
 A1 = pi * (2) ^ 2
 A1 = 4pi
 
 the area of the regular pancake is not twice the area of the silver dollar pancakes