$\text{a) }\alpha =\frac{\pi }{5}=\frac{{180}^{\circ }}{5}={36}^{\circ }<{40}^{\circ }=\beta$  

$\alpha <\beta$

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$\text{b) }\alpha =\frac{5\pi }{7}=\frac{5\cdot {180}^{\circ }}{7}={\left(128\frac{4}{7}\right)}^{\circ }<{200}^{\circ }=\beta$  

$\alpha <\beta$

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$\text{c) }\alpha =0,6\pi =\frac{3\cdot {180}^{\circ }}{5}={108}^{\circ }=\beta$  

$\alpha =\beta$

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$\text{d) }\alpha =\frac{3\pi }{11}=\frac{3\cdot {180}^{\circ }}{11}={\left(49\frac{1}{11}\right)}^{\circ }<{50}^{\circ }=\beta$  

$\alpha <\beta$