true
A cent (penny) is circular so the "greatest distance" is simply its diameter. Since 1858, all US cents have had a diameter of 19.05 mm.
SD max
The radius is half of the diameter. The diameter is double the radius. If you don't have either one then it can be pretty complicated to get an accurate measurement. If you know where the center of the circle is, then you can draw any line through the center, and measure the distance between the two points where the line hits the curved part of the circle. But if all you have is the circle, with no point to show you where the center is, then there's no simple method for measuring it precisely. You can bisect two chords, and the bisecting lines will intersect at the center, or you can just measure the greatest width (although this is not so accurate.) See the related link, The Parts of the Circle, below this answer.
Earth's circumference is greatest along the equator, measuring about 40,075 kilometers (24,901 miles). This is because the equator is the widest part of the planet, where it bulges due to the centrifugal force created by Earth's rotation. In contrast, the circumference is smaller at the poles, measuring about 40,008 kilometers (24,860 miles), due to the oblate spheroid shape of the Earth.
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true
The diameter of the Earth is greatest at the equator, measuring approximately 12,742 kilometers (7,918 miles). This is due to the Earth's rotation causing a bulging effect around the equator, resulting in a slightly larger diameter compared to the distance between the Earth's surface through the poles.
No Narrowest victory was 1 point (1991) Largest victory was by 45 points (1990)
The diameter is the width of the widest part, where the circumference is greatest.
The greatest distance across a circle is its diameter.
measuring tape
perihelion
1.25
January 3rd, semidiameter 16.3, anular diameter 2x semidiaeter 32.6, maximum / closes
A cent (penny) is circular so the "greatest distance" is simply its diameter. Since 1858, all US cents have had a diameter of 19.05 mm.
In the US, I believe the 50 cent piece has the greatest diameter.
SD max