You cannot. There is no direct relationship between perimeter and area.
If the perimeter is already measured in inches, there is nothing to convert. There are 18 inches in a perimeter of 18 inches.
You can't. Different shapes with the same perimeter may have different areas.
Multiply the radius by itself, then multiply the result by Pi.
Convert everything to kilometers (to convert meters to kilometers, divide by 1000). Then add up the four sides.
You cannot. There is no direct relationship between perimeter and area.
If the perimeter is already measured in inches, there is nothing to convert. There are 18 inches in a perimeter of 18 inches.
5cm
You can't. Different shapes with the same perimeter may have different areas.
There is no standard relationship between perimeter and area. For example, you can have two rectangles that have the same perimeter, but different area.
200mm
Multiply the radius by itself, then multiply the result by Pi.
Divide by 100: 43cm / 100 = 0.43 meters.
You can't if you don't what the height and width is.
A perimeter is not a specific linear measurement, therefore, it is impossible to convert this to a particular distance.
Convert everything to kilometers (to convert meters to kilometers, divide by 1000). Then add up the four sides.
You haven't given any measurements so I cant calculate it. Convert the centimetre side to metres by dividing by 100 and add all sides together to get the perimeter