What is the bond length of the σ-bond formed between two carbon atoms in the graphene lattice?

What is the bond length of the σ-bond formed between two carbon atoms in the graphene lattice? Correct Answer 1.42 Å

Each carbon atom in graphene lattice is bonded by covalent σ-bonds to three other neighboring carbon atoms. These σ-bonds have a bond length of 1.42 Å or 1.42 × 10-10m each.
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