A cikin wannan ɗaba'ar, za mu yi la'akari da yadda za a sami radius na wani yanki da aka kewaye game da mazugi, da kuma sararin samansa da ƙarar ƙwallon da ke daure da wannan yanki.
Nemo radius na sphere/ball
Ana iya siffanta kowa da kowa. A wasu kalmomi, ana iya rubuta mazugi a kowane fanni.
Don nemo radius na sphere (ball) da aka kewaye game da mazugi, muna zana sashin axial na mazugi. A sakamakon haka, muna samun triangle isosceles (a cikin yanayinmu - ABC), a kusa da shi da'irar da radius r.
Mazugi tushe radius (R) daidai da rabin tushe na triangle (BC), da janareto (l) - gefensa (AB и BC).
Radius na da'ira (r)kewaye da triangle ABC, a cikin wasu abubuwa, shine radius na ƙwallon da aka kewaye game da mazugi. Ana samun shi bisa ga ka'idoji masu zuwa:
1. Ta hanyar generatrix da radius na tushe na mazugi:
2. Ta hanyar tsawo da radius na tushe na mazugi
Height (h) mazugi kashi ne BE a cikin hotunan da ke sama.
Formula don yanki da ƙarar yanki/ball
Sanin radius (r) za ka iya nemo saman yankin (S) Spheres da girma (V) Sphere mai iyaka da wannan yanki:
lura: π zagaye daidai yake da 3,14.