GNU Free Documentation License . .

: ,
1   , .

́ (: , rad; . radius  , )  . , . , 2π .

, R α, , Rα.

, , ,   . () .

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:

  • 1 = (1/2π) = 180/π = 200/π .

, 180° = π . , .

α[°] = α[] × (180 / π);
α[] = α[°] × (π / 180),

α[]  , α[°] 

1 ≈ 57,295779513° ≈ 57°1744,806 ≈ 206265.

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, , .

, , , :

\sin\alpha \approx \operatorname{tg}\,\alpha \approx \alpha; \quad\alpha \ll 1.

, , :

\cos\alpha \approx 1 - \frac{\alpha^2}{2}; \quad\alpha \ll 1.

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, . , , . (  . .) . (, rad)   .

101 darad 101 drad
102 hrad 102 crad
103 krad 103 mrad
106 Mrad 106 µrad
109 Grad 109 nrad
1012 Trad 1012 prad
1015 Prad 1015 frad
1018 Erad 1018 arad
1021 Zrad 1021 zrad
1024 Yrad 1024 yrad
           

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  . , .
Radian (.)
, .
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