what is the total plate area in square cm. of a capacitor with six plates of the dimention and shape listed?

Question

capacitance is directly proportional to the surface area of the plates. dia. 22mm round to nearer hundreth square cm

Answer 1

This is actually a math question.
Surface of one plate = (diameter / 2)^2 * π = (22/2)^2*3.14xxx = 380.1327 sqmm.
Now it seems you need this for 6 plates, and in sqcm, and rounded to 1/100th.
380.1327 *6 / 100 = 22.80796266, or rounded up 22.81 sqcm.