The diameter of a round coin is 27.9 millimeters. What is the approximate area of one face of the coin?
A.100 mm2
B.200 mm2
C.600 mm2
D. 300 mm2

so you would do half of the diameter which is 13.95 (radius)

A= pi times radius squared

so it would be A= (pi)13.95 squared the answer is about 611 so C would be the correct answer

Step-by-step explanation:

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have