# Cardboard box

We want to make a cardboard box-shaped quadrangular prism with a rhombic base. The rhombus has a side of 5 cm and 8 cm, one diagonal long. The height of the box is 12 cm. The box will be open at the top. How many square centimeters do we need if we calculate the overlap and joints need 5% of the cardboard?

### Correct answer:

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#### You need to know the following knowledge to solve this word math problem:

**solid geometry**- cuboid
- surface area
- prism
**planimetrics**- area of a shape
- triangle
- rhombus
- rectangle
- Heron's formula
**basic functions**- percentages

#### Units of physical quantities:

#### Grade of the word problem:

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