anonymous
  • anonymous
i need help with a couple of problems please
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
first one: decide whether the polyhedron is regular and/or convex
anonymous
  • anonymous
First one and last one are regular because all their sides have one line through them this they are the same. The second one is concaved on some axiom and is not a regular polyhedron
anonymous
  • anonymous
okay.. the second question is describe the cross section

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anonymous
  • anonymous
and the third question is: using f+v=e+2 find the unknown number 1) faces:? vertices: 6 edges: 12 2) faces 5, vertices ?, edges 8 3) faces 7, vertices 10, edges ?
anonymous
  • anonymous
The cross section is just what shape does the cut make so: Square, hexagon and triangle
anonymous
  • anonymous
Just put the numbers into the equation and do the arithmetic for the thrir question
anonymous
  • anonymous
You can just plug those numbers in, I know you can do that, we did it last time with the angles!
anonymous
  • anonymous
I think the first cross section is a trapezoid
anonymous
  • anonymous
faces:? vertices: 6 edges: 12 f + 6 = 12 + 2 2) faces 5, vertices ?, edges 8 5 + v = 8 + 2 3) faces 7, vertices 10, edges ? 7 + 10 = e + 2
anonymous
  • anonymous
It might be a trapezoid, I can't see it too well, and yes those equations are correct, now solve! :)
anonymous
  • anonymous
NNow let her solve*
anonymous
  • anonymous
f=8 v=5 e=15

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