A diameter is measured by using a ruler. However, you also could use a digital caliper to measure the diameter of a circle.
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The diameter is a straight line measured from the edge of the circle to the opposite edge passing through the center point
No. "pi" is the 'ratio' of circumference to diameter of a circle. It doesn't care what the unit is,just as long as both are measured in the same unit.
(2*pi*radius2) + (diameter*pi*height) measured in square units
It's called the "circumference" of the circle. It's equal to (pi) times (the circle's diameter).
The diameter of a human hair can vary, but on average, it is about 0.002 to 0.006 inches in diameter. This measurement can be influenced by factors such as genetics, hair type, and overall health. The diameter of human hair is typically measured using micrometers or specialized imaging techniques.