Radiya
Radiyan shi ne na'urar ma'auni . Ana nuna ta ta hanyar alamar "rad"  ko, ƙasa da yawa, c (don ma'aunin madauwari). Radian ya kasance ɗayan ƙarin SI, to amma an canza shi zuwa naúrar da aka samu a cikin shekara ta alif Dari Tara da casain da biyar 1995. Tsawon baka na radians yayi daidai da radiyan daga da'irar da yake sashi.

Amfani 

Yawancin mutanen da ke yin lissafi ko kimiyyar lissafi suna amfani da radians, maimakon digiri, saboda wasu nau'ikan lissafin, galibi a cikin trigonometry da ƙididdiga, sun fi sauƙi yayin amfani da radians maimakon digiri. Don haka, yawancin lissafin da ke da alaƙa da mitar angular (kamar saurin angular ) suna amfani da radians a sakan daya.

Mutanen da ke duba ta hanyar na'urar hangen nesa ko maharbi sukan yi amfani da milliradians don kwatanta nisa kamar yadda aka gani ta hanyarsa.

Juyawa 
Radian 1 daidai yake da kusan 57.3°. Akwai radians 2 π (kimanin 6.28 radians) a cikin cikakken da'ira.  Tsarin juya radian zuwa digiri da akasin haka shine: 

 
 

ko:

 
 

kuma muna iya cewa:

  .

Shafukan da ke da alaƙa 

 Steradian
 Tau, ma'aunin cikakken da'irar a cikin radian
 da'irar raka'a

Manazarta