the circumference of a circle is 120 millimeters. Which of the following inqualities is true for d, the diameter of the circle measured in millimeters? A. 10<d<20

Question

B. 30<d<40
C. 50<d<60
D. 70<d<80

Answer 1

pi is about 3, so d is about 120/3 or 40.

But, pi is slightly larger than 3, so d is slightly smaller than 40.

(B)