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Aflower in the form of a sector has been fenced by a wire of $40 \mathrm{~m}$ length. If the flower-bed has the greatest possible area, then what is the radius of the sector? $\quad$
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The correct answer is:
$10 \mathrm{~m}$
$\quad \ell+2 r=40$
Area is maximum, when $\ell+2 r=20 \Rightarrow r=10$
Area is maximum, when $\ell+2 r=20 \Rightarrow r=10$
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