"One and a half inches" is approximately the same length as 38.1 millimeters (rounded),
regardless whether it refers to a piece of string, a measurement of a geographic figure,
or a blade of grass.
A circle whose diameter is one and a half inches has an area of 1.767 square inches. (rounded)
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The radius is one half the diameter so if the diameter is 8 inches then the radius is 4 inches.
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!
Assuming a circle with a diameter of one half inch, A = 2Ï€r so the area in square inches would be half of pi or about 1.57 in2.
Any number you like. You can have a tiny circle with a tiny diameter or a huge big circle with a big diameter. The diameter is simply the "width" of the circle. It is the length of the line from one side to the other which passes through the centre.
One yard is 36 inches - whether in diameter or otherwise.