A) \[\text{15}\,\text{c}{{\text{m}}^{\text{2}}}\]
B) \[\text{21 c}{{\text{m}}^{\text{2}}}\]
C) \[\text{16}\,\text{c}{{\text{m}}^{\text{2}}}\]
D) \[~\text{23}\,\text{c}{{\text{m}}^{\text{2}}}\]
Correct Answer: B
Solution :
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