Weight and height.
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Mass, acceleration of gravity, and height
Measure the width and the length and multiply the two measurements together.
Find the measurements from one corner along the wall to the next corner and then repeat with the wall next to it. Once you've found the measurements, multiply them together to find the square footage.
You need three things: m = mass of the object (in kilograms) g = gravitational acceleration constant (usually 9.8 m/s^2) h = height of the object, usually from the ground (in meters) The gravitational potential energy are these three values multiplied together: PE = m • g • h
Using a metric tapemeasure,multiply the length of your rectangle by the width.