area
42x24=1008
No. Just like a length, a perimeter is measured in linear units.
a desk
In terms of physics pressure means the force per unit area. When an object is placed on a surface such as a desk the pressure is the weight of the object against the surface.
Surface area would be measured in square inches or square feet. This is the area of a flat surface, like a desk top. Volume is the inside area, like inside a balloon. This would be measured in cubic inches or feet (inches x inches x inches).
You need to know the length and width of the desk before you can determine the area. Multiply the length by the width to get your answer (length x width = area).
Point
The best desk for your 10 year old depends on many factors, including his height. Generally, a large surface area is preferred. http://www.build-gaming-computers.com/computer-gaming-desk.html
It depends on the type of wood. A solid wood desk will be considerably more sturdy then a particle board desk. Any type of desk will be unstable if placed on an improper surface. Make sure to use the desk on a level surface or use furniture coasters to equal out any floor slope.
No. Surfaces are square inches.
Foldable desks can be great for many people, especially people with home offices. A foldable desk allows you to have a maximum amount of surface area to use while working, but can be tucked away to provide more living space once the work is done.
The length, width, height, thickness, diagonal, perimeter, are some characteristics.