To change meters into millimeters, multiply by 1000. (There are 1000 mm in 1 m.)
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From largest to smallest, kilometers, meters,decimeters, centimeters, millimeters, micrometers, nanometers, picometers.
The formula for an area of a circle is the greek symbol "pi" times the radius squared. A = π * r2 r = radius π = 3.14 Now, your radius is given to you in millimeters. Generally answers are given in meters. 7 mm (millimeters) is equal to .007 m (meters).
Any unit of length will do, for example meters, millimeters, kilometers, light-years, feet, etc.
There are 1000 millimeters in one metre, therefore: 1m2 = (10002) mm2 = 1 000 000 mm2 So there are one million square millimetres in a square metre. To work this out it is best to start in 1 dimension. 1 metre is equal to 1,000 millimetres. Square both sides and you get 1 square metre is equal to 1,000,000 square millimetres. Thus there are 1,000,000 square millimetres in a square metre.
Just as you can't ADD, SUBTRACT or CONVERT, for example, from meters to square meters and vice versa, you can't COMPARE them either. Just comparing the numbers doesn't make sense, since the numbers are quite arbitrary (they depend on the units used.As an example: a square of 1 meter x 1 meter has an area of 1 (square meter) and a perimeter of 4 (meters). But if you express the SAME square in millimeters, it has an area of 1000 x 1000 = 1 million (square millimeters), and a perimeter of 4000 (millimeters). So, as you can see, there is no sensible way of comparing area and perimeter.