Ice particles smaller than 5 millimeters in diameter is called "Sleet."
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There are several countries in which the minor currency unit is a penny - including the US where a cent is called a penny!The UK penny has a diameter of 20.3 mm.
First of all, you have to promise us that you're talking about a circle.We're going to assume that, since you mentioned 'radius'.The perimeter of a circle ... usually called its 'circumference' ... is (pi) x (the circle's diameter).The circle's diameter is (2) x (its radius).Diameter = 200 millimetersCircumference = (pi) x (200) = 628.319 millimeters (rounded)
Usually centimeters...the smaller ones are millimeters. To judge, there are 2.54 centimeters in an inch.
Molecules, and atoms that make up molecules. An atom is made of smaller particles called protons, electrons, and neutrons. Smaller to this are groups such as fermions, Hadrons, Bosons
The diameter is the length across the middle of a circle. Half of the diameter is called the radius.