Resuelve los siguientesTriángulos semejantes, Obteniendo el valor de la incógnita faltante en cada caso
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If it's a regular octahedron, then you can calculate it using the formula 
where 
is the length of the edge.
If it's not regular, you have to calculate the area of each side individually.
If it's not regular, you have to calculate the area of each side individually.