measure the Circumference of both the top and bottom edges of the sleeve. measure the height of the sleeve.
using a centerline draw the first Circumference(kinda of like a lower case "T")
measure down the height of the sleeve along the centerline, draw in the other Circumference.
connect the endpoints on the left then the right. you now have a flat drawing from which to measure your dimensions, area, etc.
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1/2 cup + 1/4 cup = 3/4 of a cup
There is a central tube that goes up and then back down through a hole at the bottom. When water is filled up half way, the water level is the same on the inside of the tube. When the water level rises enough for it drop out through the cup, it creates a vacuum that sucks up all the water in the cup leaving it empty.
One third of a cup
Cup
3/8 cup