### Video Transcript

Triangles

In this video, we will learn how to
identify triangles regardless of their orientation, size, or color. A triangle is a 2D shape. Triangles have one, two, three
sides. Each of the sides is straight. So we can say that triangles have
three straight sides. Triangles also have three corners
or vertices. Triangles can come in different
colors and different sizes. They can also come in different
orientations. That means we can turn a triangle
around. It’s still a triangle. We know a 2D shape is a triangle if
it has three sides and three corners.

Let’s practice identifying
triangles using these features with some practice questions.

Which of these is a
triangle?

In this question, we’re shown
three different 2D shapes. We have to choose the one which
is a triangle. Triangles have three straight
sides and three corners. Which of these shapes has three
sides and three corners? Let’s count the number of sides
that the first shape has. One, two, three, four. This shape has four sides. It’s not a triangle. Let’s count the number of sides
that the second shape has. One, two, three. Let’s check it has three
corners. One, two, three. Yes it does. This shape is a triangle.

Pick the matching shape.

We’re shown a shape. It’s an orange shape. It has three straight sides and
three corners. This shape is a triangle. Which of these shapes is also a
triangle? Both of these shapes have four
sides, so they’re not triangles. Triangles have three sides. Is this a triangle? It does have three sides and
three corners. It’s a triangle. This is the matching shape. They’re both triangles.

Choose the triangle.

We’re shown five different 2D
shapes. We have to choose the one which
is a triangle. Triangles have three straight
sides and three corners. This is a circle, doesn’t have
any corners or any straight sides. This shape has four straight
sides, so it can’t be a triangle. These two shapes also have four
straight sides. So we know they’re not
triangles either. This shape has three straight
sides and three corners. It’s a triangle. We chose the triangle.

What have we learned in this
video? We’ve learned how to identify
triangles. We’ve also learned that triangles
have three straight sides and three corners.