Video: KS1-M17 • Paper 2 • Question 29

Two shapes have more than 8 edges. Tick them.

02:27

Video Transcript

Two shapes have more than eight edges. Tick them.

We have to work out which of these four shapes have more than eight edges. An edge in a 3D shape is the place where two faces meet. So this cylinder has two edges. It’s difficult to count the edges on this shape. Let’s try to draw it to help count the edges. This is one of the faces. It’s a triangular face. It has three edges. The shape has another triangular face. We can’t see it. But it would be somewhere about here. So now, we have six edges so far. Another edge across the top makes seven. And if we joined up the edge at the bottom, that makes eight. And one more edge makes nine. So we can tick this shape because it has more than eight edges.

We can’t see all of the edges on this cuboid. So let’s try to draw one and count the edges as we go. So far, we have four edges. We’ve added another square and another four edges. So now, we have eight, nine, 10, 11, and 12. So this shape also has more than eight edges.

The two shapes that have more than eight edges have been ticked: the cuboid and the triangular prism. The triangular prism had nine edges and the cuboid had 12. So these are the two shapes that have more than eight edges.

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