մdz-ìDzԲ leth-chruinne
Mar a thuigeas tu, 's e leth de chruinne a tha seo.
\(\text{մdz-ìDzԲ}\, \text{leth-chruinne} = \frac{1}{2}\text{tomhas-lìonaidh}\, \text{cruinne}\)
Eisimpleir
Tha bobhla ann an cruth leth-chruinne le trast-thomhas de 13 cm. Lìonaidh Trisha am bobhla le uisge airson coinnlean-sheòlaidh a chur ann. Dè an uimhir as motha de dh'uisge a ghabhas am bobhla?
Freagair ann am milemeatairean gu 2 fhigear bhrìgheil.
Freagairt
Trast-thomhas = 13 cm 's mar sin 's e an radius = \(13 \div 2 = 6.5\,cm\).
մdz-ìDzԲ Cruinne = \(V = \frac{4}{3}\pi {r^3}\)
\(= \frac{4}{3} \times \pi \times {(6.5)^3}\)
\(= 1150.346...\)
\(\text{մdz-ìDzԲ}\, \text{leth-chruinne} = \frac{1}{2}\text{tomhas-lìonaidh}\, \text{cruinne}\)
\(= 0.5 \times 1150.346...\)
\(= 575.173...c{m^3}\)
Bhon tha \(1\,c{m^3} = 1\,ml\), gabhaidh am bobhla 580 ml (gu 2fb).