Make R the subject of the relation V = πl(R² - r²)

Correct Answer is : R = Vπl+r2{\;V/π l + r²πlV+r2

Correct Answer is : R = Vπl+r2{\;V/π l + r²πlV+r2

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WAEC Mathematics 2024 Paper

Question : 15

Total: 50

^2

^2

)

Solution:

V = πl(R $^2$ - r $^2$ )

Divide both sides by πl

$\;\frac{V}{\pi l}$ = (R $^2$ - r $^2$ )

R $^2$ = $\;\frac{V}{\pi l}$ + r $^2$

Take the square root of both sides

R = $\sqrt{\;\frac{V}{\pi l} + r^2}$

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