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Use `pi=22/7` किसी समबाहु त्रिभुज की भुजा 8 सेमी. है। परिवृत्त तथा अतः के बीच क्षेत्रफल का अंतर ज्ञात करें?
A. `50 1/7 cm^(2)`
B. `50 2/7 cm^(2)`
C. `75 1/75 cm^(2)`
D. `75 2/7 cm^(2)`

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Correct Answer - B
परिवृत्त की त्रिज्या `=8/(sqrt(3))cm`
अन्तःवृत्त की त्रिज्या `=8/(sqrt(3))=4/(sqrt(3))cm`
अभीष्ट क्षेत्रफल
`=pi(R^(2)-r^(2))`
`=22/7((8/(sqrt(3)))^(2)-(4/(sqrt(3)))^(2))`
`=22/7(64/3-16/3)`
`=22/7xx16=50 2/7 cm^(2)`

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