The width of a rectangular parallelepiped is 4.5 cm, which is 2 times less than its length and 0.9 cm

The width of a rectangular parallelepiped is 4.5 cm, which is 2 times less than its length and 0.9 cm more than its height. Find: a) the sum of the lengths of all edges, b) its surface area, c) its volume

Since the width is half the length, then the length will be:
4.5 cm x 2 = 9 cm.
Since the width is 0.9 cm larger than its height, then the height will be:
4.5 cm – 0.9 cm = 3.6 cm.
1) There are 4 ribs in a parallelepiped – they are also the height, which means the sum of the lengths of the ribs is:
3.6 cm x 4 = 14.4 cm.
2) the surface area is equal to.
9 x 4.5 cm = 40.5 cm.
3) The volume is V = a x in x s.
4.5 cm x 9 cm x 3.6 cm = 145.8 cm cubed.