Which of the crystal systems has all the axial angles equal but not equal to `90^(@)`?

Which of the crystal systems have all the axial distances (or edge lengths )equal?

Crystal systems in which no two axial lengths are equal are

Which of the following has all equal total angles ?

Which of the following given molecules has all the bond angles equal to 120°?

Number of crystal systems having, only 2 types of Bravais lattices = x, Number of crystal systems having, at least 2 interfacial angles equal = y, All the three interfacial angles and all the three axes lengths equal = z Then find y -(x +z) .

Number of crystal systems having only 2 types of bravais lattices = x, number of crystal system having at least two interfacial angles equal = y and number of crystal systems having all the three edge lengths equal = z. Then find the value of x xx y xx z.

Number of crystal systems having only 2 types of bravais lattices = x, number of crystal system having at least two interfacial angles equal = y and number of crystal systems having all the three edge lengths equal = z. Then find the value of x xx y xx z.