Use positive numbers for altitudes above sea level, zero is sea level itself, and negative numbers for altitudes below sea level. As for the picture, use a number line - but make vertical instead of using the commonly used horizontal position.
In basic mathematics, a number line is a picture of a straight line that serves as representation of negative and positive numbers.
What meter is used for a picture frame
The rule is if a number is positive you add them. EX: 4+4=8 But if the numbers are both negative... you forget the plus sign and just put the numbers together and use whatever sign they have. EX: -4-4= -8 you see? you are adding them put if they are negative, they go down the number line. not up. Just picture a number line, if you add a negative number to an already negative number, wouldn't the number go to the left? The answer is yes. Yes it would. :)
57" above the finished floor to the center of the picture. Measure from the picture center to the hanger and add that to the 57".
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Picture legends
Negative. Sorry. No you do not. Adding a negative to a negative gives you a number that is even more negative. Picture a number line. A negative number is to the left of zero, and adding a negative number moves further left. ■
Measure the inside area where the picture will go.
yes
Dim picture, slow to get bright and the white part of the picture turns kind of negative looking.
A small picture frame hanging in your house, for example, would be best measured with either a small tape measure, or a 12 inch ruler. Bigger pictures would need a longer tape measure.
Millimetres if you are making the picture frame; centimetres if you wish to buy a ready-made frame.