You need to find the circumference of a small sphere. The measurement instruments at your disposal are a 1-meter ruler, a caliper, and a mass scale. Which of the following would be an appropriate plan for finding circumference? a Try to hold the sphere against the ruler and guess the length of the diameter. Then use the formula C = d to find the circumference. b Use the mass scale to find the volume of the sphere. c Use the caliper to find a precise measure of the diameter of the sphere and then use the formula C = d to find circumference. d Try to bend the ruler around the sphere and guess the circumference