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Year 11 (2025) Maths Standard (2025) Formulae and Equations

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Questions
Question 1
21335

The total surface area of a hemisphere (curved surface plus the flat base) is given by \(A=3\pi r^2\).

Find the radius of a hemisphere with a total surface area of \(18.75\pi\text{ cm}^2\).

Give your answer as a decimal.

\(r=\) 
2.5
 \(~\text{cm}\) 1 mark

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