Junior Cycle · Area, Volume and Measurement
⏱ Tested in 1 exam question since 2022
Lesson 6 of 7
JCHL AVM 6: Sphere
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- Surface area of a sphere = 4πr²; volume of a sphere = (4/3)πr³ (both on page 10 of your maths tables)
- A sphere has only ONE measurement (the radius) and is all curved, so its total surface area IS its curved surface area
- A hemisphere is half a sphere, so halve both formulas: volume = (2/3)πr³ and curved surface area = 2πr². These are NOT in your maths tables — learn them
Formula used
A = 4π r², V = ⁴⁄₃π r³
Hemisphere: V = ⅔π r³, curved = 2π r² — MUST LEARN
Closed hemisphere: total = 2π r² + π r² = 3π r² — MUST LEARN
On page 10 of the log tables — read it off, don’t memorise.Most recent exam questions
- 2022 Q5(b)(i)
- 2022 Q5(c)
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