Glass
How many glass are needed to produce glass with base regular 5-gon if one base triangle in the base is 4.2 square cm and the height is 10 cm?
Correct answer:

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You need to know the following knowledge to solve this word math problem:
- algebra
- expression of a variable from the formula
- solid geometry
- surface area
- prism
- planimetrics
- polygon
- area of a shape
- triangle
- goniometry and trigonometry
- tangent
Units of physical quantities:
Grade of the word problem:
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