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Dimensions of a Twin (single) bed: 39" W x 75" L Dimensions of two Twin (single) beds placed side by side: 78" W x 75" L Dimensions of a Queen bed: 60" W x 80" L So, if you put a queen mattress onto a pair of twin box springs, the mattress will hang over the foot of the bed by 5", and it will be 9" too short on each side (it won't cover the box springs). You'll have to get a queen-sized box springs.
On paper = 2 dimensions Physical = 3 dimensions Examples: a square is 2 dimensions and a cube is 3 dimensions a circle is 2 dimensions and a ball is 3 dimensions
A ray can be in 2 dimensions, in 3 dimensions, or in fact in any number of dimensions.
the plane, or xy plane, has two dimensions space has 3 dimensions
The dimensions of a plane are length and width.