Final answer:
The subject of this question is Mathematics. The student is asking about the measurements of a zigzag crystal vase and how to calculate its volume.
Step-by-step explanation:
The subject of this question is Mathematics and the grade level is High School.
The student is asking about a zigzag crystal vase with a height of 20 centimeters. The cross sections of the vase parallel to the base are always rectangular and measure 12 centimeters in width and 6 centimeters in length.
This information can be used to calculate the volume of the vase. The volume of a rectangular prism can be found by multiplying its length, width, and height. In this case, the volume of the vase would be 20 cm * 12 cm * 6 cm = 1440 cm³