90
3 rhombuses will fit into one Hexagon...so it would be 20x3
Infinitely many. Any rhombus can be divided into smaller rhombi, thereby increasing the total number.
7
Six of them.
2 rhombuses
there are three rhombuses in an octagon.
20 hexagons
50
4 hexagons; A hexagon has 6 sides, thus, if you have 4 hexagons, 4x6=24
There cannot be a 3-d shape all of whose faces are regular hexagons.---that claim above is not true, because for example a classic soccerball consists of hexagons.
Most of the time, rhombuses have no right angles, but a square is also a rhombus, so if it was a sqare, then there would be four right angles, but it will most likely be none.