Mega pixels to you a picture tells how big it is. digital photos of small points in the name of pixels and each of these pixels can immediately different color and Light.
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this cannot be answered without pixel density information
If the perimeter is already measured in inches, there is nothing to convert. There are 18 inches in a perimeter of 18 inches.
1 foot = 12 inches, 18 feet = 216 inches.
A pixel is a point on the screen. It is short for "picture element". These can come in different sizes.
221 inches