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A plane horizontal surface with no depth refers to a flat area on a curved surface.
Given the information in the question, there is no need for any inequality. the flat surface can be described as an equality. Outer diameter = one and a half inches => outer radius = 0.75 inches. Inner diameter = three fourths inches => inner radius = 0.375 inches. Area = pi*(0.752 - 0.3752) square inches. So one possible set of inequalities is 0 < area < 1,000,000,000 sq inches!
Yes.
a flat PLAIN is a flat area of land
A flat surface generally refers to a horizontal surface and is referred to as the plane.