Concrete pillar

How many cubic meters of concrete are needed to construct the pillar shape of a regular tetrahedral prism when a = 60 cm and the height of the pillar is 2 meters?

Correct answer:

V =  0.72 m³

Step-by-step explanation:

$$\begin{gathered} a=60\text{cm}\to \text{m}=60:100\text{m}=0.6\text{m} \\ c=2\text{m} \\ V=a\cdot b\cdot c;a=b \\ V=a^2\cdot c=0.6^2\cdot 2=0.72{\text{m}}^3 \end{gathered}$$

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