A) \[15\pi \]
B) \[12\pi \]
C) \[18\pi \]
D) \[8\pi \]
Correct Answer: A
Solution :
[a] \[PS+PS'=10\] \[2a=10\] \[a=5\] \[2ae=8\] \[ae=4\] \[e=4/5\] \[{{b}^{2}}={{a}^{2}}(1-{{e}^{2}})\] \[{{b}^{2}}=25\left( 1-\frac{16}{25} \right)\] b=3 \[A=\pi ab=\pi \times 5\times 3\] \[=15\pi \]You need to login to perform this action.
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