Chat with our AI personalities
5 sided 2-dimensional object
The perimeter is a characteristic of a 2-dimensional object. A 12 by 13 by 5 sounds like a 3-dimensional object which would not have a perimeter.
A five-sided 2-dimensional shape is a pentagon.
Pentagon
0. A triangle is a 2-dimensional object and so its volume - which requires a 3-dimensional object - is always zero.