10
8 straws 4 for the square base 4 for 1 each of the sides, to meet at the top.
12 straws
<X X> It should look kinda like the example above. Except it would be squares lol. Make two crosses with the 4 long straws put the ends of these together so that one square is made then make two right angles with the four short straws and place them at the other side of each cross to make three squares in a diagonal line. :)
6 and 10 are triangular numbers that make 16.
8
8
10
16 straws.
8 straws.
12
Because a triangular pyramid has 6 edges
depends on the dimensions of the 4 sides
9
10
8
A cube has 6 faces and a triangular pyramid has 5 faces. So a cube has 1 more face than a triangular prism. But a triangular pyramid has four faces. You make the call. That is correct: A triangular prism has five faces, and a cube has six faces, but a triangular pyramid has four faces.