Question

what kind of polyhedron is this?

Answer 1

i cant find it anywhere online

Answer 2

4 triangles and a square base

Answer 3

tetra - 4 faces
hexa - 6 faces
octa - 8 faces

so count the faces

Answer 4

five faces

Answer 5

do you know the prefix for 5 think polygons

Answer 6

no

Answer 7

don't know the name of a large military building in Washington DC

Answer 8

pentagon

Answer 9

which part means 5

Answer 10

it is a square pyramid

Answer 11

penta

Answer 12

ok... and specifix polyhedra have names the end in hedron so just combine the 2

Answer 13

pentahedron?

Answer 14

not all of them, only platonic ones there are three types of polyhedra prism pyramid and platonic

Answer 15

correct... it means 5 flat faces....

Answer 16

okay, thanks guys!

Answer 17

hope it helps

Answer 18

do you know if this is a regular polyhedron, and why?

Answer 19

yes... they are the platonic solids.... and they are made up of identical shapes... there are only 5 of them.

Answer 20

okay, thanks man

Answer 21

I think you'll find that this matches your figure.
http://en.wikipedia.org/wiki/Pyramid_(geometry)

And if you look at the definition of regular polyhedron, you'll see this is not one.
http://en.wikipedia.org/wiki/Regular_polyhedron

And it's not a Platonic solid either.
http://en.wikipedia.org/wiki/Platonic_solid

After you've done that, ping me if you have questions.

Answer 22

ok, thanks telliott.