If you wish to know about the names and types of science dimensions, then have a crack at SI Units in Wikipedia.org
you can be 21 at the youngest and can really work up to any age but the most average age is 23 and 24
3x5
A point by definition has no dimensions
No. The dimensions are: Mass, Length, Time, and Charge. They transcend the systems of units. For example, speed will always have the dimensions of (Length)/(Time), regardless of the system of units.
The Product Dimensions are 20 x 22 x 21 inches
21 x 2 has greatest perimeter
Ahem...ready for some mind-bending? Higher dimensions are not something you can visualize, but they exist in mathematical and physics theories. Is the correct number 21, or 11, or 17...well it depends and the matter has not yet been resolved. These are very complicated matters dealing with questions of ultimate reality. But don't plan on moving to a higher dimensional plane anytime soon.
21/4 = 5.25, Square with side equal to 5.25 units
525 square feet (21 x 25)
Those ARE the dimensions. However, this size house covers a ground area of 1,134 square feet.
Time is one dimension, not four. If you combine it with space, you can "visualize" it as four dimensions: three dimensions of space, one of time. Sort of visualize it - we can't really visualize four dimensions.
The only ones are (1 x 21) and (3 x 7) .
The dimensions of A4 paper are 210 by 297 millimeters In cm, that's 21 cm × 29.7 cm Or about 9 by 12 inches.
no one actually knows I've heard there are as many as 13 dimensions, in the field of pure physics.
21 feet https://www.revisor.leg.state.mn.us/rules/?id=2400.0540
26.4 inches for the diagonal.