### Video Transcript

Composing 2D Shapes

In this video, we will learn how to
compose simple 2D shapes to make larger shapes. We could make a rectangle using two
triangles. We made or composed a shape using
smaller shapes. We made this rectangle using a
square and a smaller rectangle. We used two smaller shapes to make
a larger shape. We could compose a square using two
triangles or four triangles. Let’s practice composing simple 2D
shapes to make larger shapes.

Which shape has Victoria made out
of triangles?

Victoria has placed two triangles
together to make a new shape. What’s the name of the new shape
that she made? It’s a rectangle. Victoria has used two triangles to
make a rectangle.

Can I make a rectangle by joining
these squares together?

If we place our three squares
together, have we made a rectangle? Yes, we have. The answer to the question is
yes. If we join three squares together,
we can make a rectangle.

Daniel is trying to fit triangles
into this hexagon. How many triangles will he need in
total?

Daniel is trying to make a hexagon
using triangles. We have to work out how many
triangles he will need. So far, Daniel has used one, two,
three, four triangles. How many more triangles do we need
to complete the hexagon? We’ve added one more triangle. If we add another, the hexagon is
complete. Daniel had already placed four
triangles together to make his hexagon. We needed two more triangles to
complete it. The total number of triangles that
Daniel used is six because four plus two is six. To complete Daniel’s hexagon, he
will need six triangles in total.

Which shape has been made using
triangles only?

Which of the three shapes has been
made using only triangles? The first shape is a triangle. But has it been made from three
triangles? No, it hasn’t. And our second shape has been made
from two triangles. But it’s also used a rectangle. Our third shape is made from four
triangles. The square has been made using only
triangles. This is the shape we’re looking
for. The square has been made using only
triangles.

What have we learned in this
video? We’ve learned how to compose 2D
shapes to make new shapes.