A) \[24\,{{m}^{2}}\]
B) \[30\,{{m}^{2}}\]
C) \[48\,{{m}^{2}}\]
D) \[40\,{{m}^{2}}\]
Correct Answer: B
Solution :
Let \[BC=1.2\]decameter = 12 m \[AC=130\,dm=\frac{130}{10}m=13\,m\] and \[AB=5\text{ }m\] Now, it is clear that, \[A{{B}^{2}}+B{{C}^{2}}=A{{C}^{2}}\] So, it is a right angled triangle. \[\therefore \] Area \[=\frac{1}{2}\times BC\times AB=\frac{1}{2}\times 12\times 5=30\,{{m}^{2}}\]You need to login to perform this action.
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