The formula for the volume of a rectangular prism is V = l*w*h, length*width*height.
Let's insert the given information into the formula.
186 = length*width*1.6
The length and the width are in the formula, and area is length*width, so you can find the area.
Divide by 1.6 on both sides.
116.25 = length*width
116.25 = Area
The area is 116.25 cm^3