The answer depends on the units used for the mass and volume. Without measurement units, the answer has no meaning.
Depthxheightxwidth
A triangle has area, not volume.
Amazon River
Volume of a cube = L × W × H
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What is anything that has volume and mass
The term for anything that has mass is "matter."
Yes, the mass of the ice cube remains the same after melting. This is because mass is conserved during a phase change, so the total amount of matter remains constant even though the state of the matter changes from solid to liquid.
Matter is anything that has mass and volume (takes up space).
41.7 cm3