# In a rectangular parallelepiped, the sides of the base are 3 cm and 4 cm, and the height

October 9, 2021 | education

| **In a rectangular parallelepiped, the sides of the base are 3 cm and 4 cm, and the height of the parallelepiped is 5 cm. Find the area of the diagonal section.**

Since the parallelepiped is rectangular, there is a rectangle at its base.

Let us draw the diagonal AC of the parallelepiped’s base and determine its length by the Pythagorean theorem.

AC ^ 2 = AD ^ 2 + CD ^ 2 = 4 ^ 2 + 3 ^ 2 = 16 + 9 = 25.

AC = 5 cm.

The diagonal section of the parallelepiped is a rectangle АА1С1С, then its area will be equal to:

Ssection = AA1 * AC = 5 * 5 = 25 cm2.

Answer: The area of the diagonal section is 25 cm2.

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