Demak, har qanday aylana uchun yuzani topish formulasi:
S = πr2
Bizga hozir radius kerak. To'g'ri burchakli uchburchakka tashqi chizilgan aylana radiusi uchburchak gipotenuzasining yarmiga teng, ya'ni r = gipotenuza / 2. Demak, agar aytaylik uchburchak gipotenuzasi 6sm deb olinadigan bo'lsa, unda aylananing yuzasi:
S = 3,14 * (6/2)2 = 3,14 * 9 = 28,26 sm2