A) 4 cm
B) 5 cm
C) 7 cm
D) 40 cm
Correct Answer: A
Solution :
[a] Lateral surface area of a prism = 120 ah + ah + ah =120 3 ah = 120 \[ah=\frac{120}{3}\] ah = 40 ...(i) Volume of prism \[=40\times \sqrt{3}\] \[=40\times \sqrt{3}\] \[{{a}^{2}}h=40\times 4\] (ii) From Eq. (i) ah = 40 Then, \[a\times (ah)=40\times 4\] \[a\times 40=40\times 4\] \[a=4cm\] |
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