When you have factors in shapes you must remember: circumference and perimeter are in one unit measures area is in squared units volume is in cubed units
So, when the circumference of A is 4 times that of C there is a factor of 4. Since we need to know the area the factor 4 will change to a factor of 4² since area is a squared unit.
The solution is 4²=16, the are of circle A is sixteen times the area of circle B.
Vertical line is removed then horizontal. Its goes blue, red, blue. A vertical line is to be removed and the colour is red. That leaves B as the answer.
