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P=a²√3
a²√3dm²=20√3dm² /:√3
a²=20dm²
a=√20dm²
a=2√5dm
V=a³√2/12
V=(2√5dm)³√2/12
V=40√5×√2/12
V=40√10/12
V=10√10/3dm
zrobimy to ze wzoru na pole.
P=a²√3
a²√3dm²=20√3dm² /:√3
a²=20dm²
a=√20dm²
a=2√5dm
V=a³√2/12
V=(2√5dm)³√2/12
V=40√5×√2/12
V=40√10/12
V=10√10/3dm