There are two more Platonic solids: an octahedron which has 8 faces that are all triangles and an icosahedron which has 20 faces that are all triangles. How many edges would each of these solids have? (Keep in mind that each edge is used in two faces.)
Use your discoveries from the activity to determine how many vertices each of these solids would have.
For all 5 Platonic solids, determine how many faces meet at each vertex.

Each has 30 edges and 20 equilateral triangle faces with five meeting at each of its twelve vertices. Both have icosahedral symmetry. LET ME KNOW IF HELPED

the answer is here: : )

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none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square