Kąt pełny ma miarę 2π radianów, więc:

${360}^{\circ }=2\pi \mid :360$  

$1^{\circ }=\frac{\pi }{180}$  

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$\text{a)}{450}^{\circ }=450\cdot \frac{\pi }{180}=\frac{5}{2}\pi =2,5\pi$  

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$\text{b)}{750}^{\circ }=750\cdot \frac{\pi }{180}=\frac{25}{6}\pi =4\frac{1}{6}\pi$  

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$\text{c)}{900}^{\circ }=900\cdot \frac{\pi }{180}=5\pi$  

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$\text{d)}{1000}^{\circ }=1000\cdot \frac{\pi }{180}=\frac{50}{9}\pi =5\frac{5}{9}\pi$  

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$\text{e)}-{1200}^{\circ }=-1200\cdot \frac{\pi }{180}=-\frac{20}{3}\pi =-6\frac{2}{3}\pi$  

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$\text{f)}-{600}^{\circ }=-600\cdot \frac{\pi }{180}=-\frac{10}{3}\pi =-3\frac{1}{3}\pi$  

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$\text{g)}-{990}^{\circ }=-990\cdot \frac{\pi }{180}=-\frac{11}{2}\pi =-5,5\pi$  

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$\text{h)}-{1500}^{\circ }=-1500\cdot \frac{\pi }{180}=-\frac{25}{3}\pi =-8\frac{1}{3}\pi$