Name: 不同大小的圓圈。Scratch編程2.0 (Circles of Different Sizes: Programming in Scratch 2.0)
Uploaded: 2021-01-14T08:06:30.000Z
Duration: 2 min 33 s
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COLLEEN LEWIS: We've already drawn a bunch of shapes.

未來簡單式

And now we're going to look at how to draw circles of different sizes.

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Here, I still have my code from drawing a triangle, a square, a pentagon,

We're going to use ideas from these to draw a circle.

So let's check that they all still work--

a triangle, a square, a pentagon, and a hexagon.

And in each of these, we turn a total of 360 degrees.

So we're going to want to turn a total of 360 degrees for the circle as well.

Let's start off, and let's only turn one degree.

And to turn a total of 360 degrees, that means we'll have to repeat 360 times.

Oh whoa-- 360-- repeating 360 times means that we have 360 sides,

I have my clear script here, so I can press space and get

So instead of moving 50 steps, let me just try moving one

Now if I want something bigger, I don't want to do something like 10.

Let me look at even how much bigger 1.5 is.

Because we had 360 sides, even increasing each side's length by 0.5

really changes the size of the circle a lot.

I can also make something smaller by just moving 0.5 steps on each side.

We can think about how big this circle is

going to be by thinking about the perimeter.

So when I move one step each side, I repeat that 360 times.

If I move two steps on each side, I repeat

So you can see by multiplying these numbers

how much it's going to move total, and that

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不同大小的圓圈。Scratch編程2.0 (Circles of Different Sizes: Programming in Scratch 2.0)

bunch

script

increase

draw