– or an ice cream! … which is just the volume of a cone and hemisphere, added together 🙂
– the formulas are given on the exam paper (although you should learn them :-))
and
– if you work through logically it should be straightforward.
The questions usually involve calculating a volume of a cone, sphere or hemisphere. There might be a couple of ‘curve balls’ such as different units, diameters given etc.
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Volume of a cone
where
r is the radius at the base
h is the height
pi is given in the exam paper (usually 3.142)
Volume of a sphere (a ball)
where r is the radius
pi is given in the exam paper (usually 3.142)
A hemisphere is just half a sphere so you can calculate the total and then divide by two.
Putting it all together!
So, how big is an ice cream?
I calculated around 330 cm³ and it was great fun – have you ever tried measuring an ice cream?!
Watch the videos on YouTube
How to work out the volume of a cone