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If you mean a 3 inches by 4 inches rectangle then its perimeter is 14 inches
There is no such thing as a 3-dimensional triangle. A triangle is a 2-dimensional figure. So, depending on what you mean exactly, the volume can vary. In the case of a pyramid - whether it has a triangular base, a rectangular base, or any other base - the volume is (1/3) Bh, that is, 1/3 times the area of the base times the perpendicular height.
A rectangular pyramid is a 3-dimensional object called a pentahedron. It has a rectangular base. To each side of the base are attached triangles that rise so as to meet at a single point above the base.
That depends what base the ' 3 ' is in now.
"Square" means to times it itself twice. For example, if I were to square 3, it would be 3 x 3. If I were to square four, it would be 4 x 4. Now, to provide a little more information, "cubed" means to times itself three times. So if I were to cube 3, it would be 3 x 3 x 3. If I were to cube four, it would mean 4 x 4 x 4. These are called exponents. Exponents are numbers above the base. Typing, it would be, take 3, for example, 3^2 if you wanted it to be squared. If it would be cubed, it would be typed as 3^3. The first number is the main number, or the base, and the second number, or exponent, is how many to times the base by. For example, 3^2 would mean 3 x 3. The exponent, in writing, would be in smaller text hovering next to the base, just as if you were to write 3rd.