text: find the following measures for a circle with radius equal to 4" & width a centralangle equal to 90*..? (*=degrees)  circumference=? area=? area of smaller sector=? area of smaller segment?  if you can help me out please try circumference is pi times diameter area is pi times the (radius squared)  not really sure what you mean by the rest but i hope this helps.  if you mean the angle makes it look like a quarter of the circle you can find the area of that piece by dividing the area of the whole circle by 4.