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39 inches
Presumably the dimension of 2 units is the thickness of the boards in which case 3 boards are needed because 6*8 = 48 and 144/48 = 3
1188 of them.
Two
You don't - you need additional information. Many different rectangles can have the same diagonal. If you know the diagonal and one side (which must be LESS than the diagonal), you can use Pythagoras' Theorem to calculate the other side.
Assuming you are laying the boards flat, you will need 137 boards if you leave no gaps between them.
18
Each board has area of (4 x 8) = 32 square feet.Number of boards = (400 / 32) = 12.5 boards
A diagonal cannot be a side of a rectangle, and a side cannot be a diagonal.
There are four diagonal lines in a hexagon.
4' x 8' = 32'224' x 32' = 768'2768 / 32 = 24 boards.
19
39 inches
Presumably the dimension of 2 units is the thickness of the boards in which case 3 boards are needed because 6*8 = 48 and 144/48 = 3
The mongols hoarded as many boards as they could hoard if they could hoard boards.
A heptagon has 4 diagonal lines and 7 sides and it has 2 congruent diagonal lines and 2 congruent triangles
1188 of them.