There are an infinite number of points on the circumference of a circle and an infinite number of points on a semi-circle so the answer to your question is "An infinite number of pairs of points."
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Measure the distance between the two end points!
Measure the perimeter of the wheel using a tape measure. Then use the formula to find out the diameter D = perimeter/3.14 ========================================== You could certainly do it that way. But it would be much more direct to just measure all the way across the wheel, between the two points on the edge of the wheel that are furthest apart. That would be the diameter.
the measure of a straight-line distance between two points is called length.
circumference/pi Divide the area by Pi (3.1415926535...). Take the square root of the result and multiply it by 2. Measure the distance between 2 opposite points
One measure of distance between them.