# Quadrilateral 21523

Calculate the surface area and volume of a regular quadrilateral pyramid if the edge of the lower base is 18 cm and the edge of the upper base is 15 cm. The wall height is 9 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
**arithmetic**- square root
- square (second power, quadratic)
**solid geometry**- pyramid
- surface area
**planimetrics**- Pythagorean theorem
- right triangle
- square

#### Units of physical quantities:

#### Grade of the word problem:

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