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एक ठोस एक अर्द्धगोले पर खड़े एक शंकु के आकार का है जिनकी त्रिज्याऐं 1 सेमी है तथा शंकु की ऊँचाई उसकी त्रिज्या के बराबर है । इस ठोस का आयतन `pi ` के पदों में ज्ञात कीजिए ।

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शंकु के लिए, त्रिज्या, `r_(1)=1` सेमी तथा ऊँचाई , `h_(1)=1`सेमी
अर्ध्दगोले के लिए, त्रिज्या ,`r_(2)=1`सेमी
अतः ठोस का आयतन = शंकु का आयतन + अर्ध्दगोले का आयतन
`=1/3 pi r_(1)^(2)h_(1)+2/3 pi r_(2)^(3)`
`=1/3 pi xx (1)^(2)+2/3 pi xx (1)^(3)`
`= pi "सेमी"^(3)`
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