Video: Counting Triangles in 2D Composite Shapes

How many triangles have I used to make this rectangle?

00:50

Video Transcript

How many triangles have I used to make this rectangle?

We know that triangles are figures with three sides. How many three-sided figures, how many triangles, are part of this rectangle? I notice one, two, three yellow triangles. I also notice one, two, three pink triangles. Three pink triangles plus three yellow triangles equal a total of six triangles. This rectangle is made up of six triangles.

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