Meteorologist Ray Petelin is back with another home science lesson!By Ray Petelin

PITTSBURGH (KDKA) — I have a new problem this week. I need to get a round coaster through a square hole without ripping the paper.

Here is the big issue with this problem.

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(Photo Credit: KDKA Weather Center)

The coaster is 4 inches in diameter, while the longest part of the square, the diagonal, is only 3 inches.

(Photo Credit: KDKA Weather Center)

Let’s look at what we have to work with a different way. Here is the piece of paper I cut out of the hole. This has the same 3-inch diagonal, so the coaster is obviously still bigger.

(Photo Credit: KDKA Weather Center)

What we can do, though, is cut the square in half, and you will see that it creates an area that, if it were the hole in the paper, the coaster would pass through.

(Photo Credit: KDKA Weather Center)

We are looking at this paper in only two dimensions. If we look at the paper in three dimensions, we could probably make that square hole into something big enough to pass our coaster through. How?

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(Photo Credit: KDKA Weather Center)

With creative folding, of course. If we fold the paper in half, the hole’s diagonal is still only 3 inches.

(Photo Credit: KDKA Weather Center)

If we carefully bend the paper outward, you will notice the length of where the diagonal was increases to four inches. That is big enough for the coaster to fit. You will also notice part of the paper lifts.

(Photo Credit: KDKA Weather Center)

This is how we are creating a 3-dimensional solution.

At this point, make a fold on the outside of the paper where it lifts. The inside will do something similar. You can fold there, too.

(Photo Credit: KDKA Weather Center)

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Now, the coaster fits!