1/2 x length of the diagonals
Area of rhombus = 0.5 times the product of its diagonals
4
4
NO
no, every rectangle is not a rombus
2 lines of symmetry
A rombus is a sort of dimond shape, a bit like a kite.
Yes. But not "rombus", that's "rhombus".
16
It has 1,345,890 diagonals
A undecagon has 44 diagonals. A dodecagon has 54 diagonals. An octagon has 20 diagonals. A heptagon has 14 diagonals.