A.4
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Answer: The area of the cross section is 2 cm^2.
If I am understanding your problem correctly, we are just looking for the area of the grey rectangle, which is the cross section.
The length and width of this gray rectangle are already given to us. The are 1 and 2. Just multiply them to get the area.
1 x 2 = 2 cm^2
Since you already have the circumference, you will divide 56 (Circumference) by pi. Which will get you the diameter*
Formula :: C/
3x-15/2=4x
3x-4x=15/2
-1x= 15/2
x= -15/2