Source: Magoosh
The octahedron is an eight-faced geometric solid that can be thought of as two square-based pyramids with the squares glued together. All eight faces of the octahedron are congruent equilateral triangles. Given that an edge is where the side of one equilateral triangle is attached to the side of another equilateral triangle, how many edges does the octahedron have?
A. 8
B. 10
C. 12
D. 16
E. 18
The OA is C
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