Doira yuzasini hisoblash uchun quyidagi formuladan foydalanish mumkin: yuza (A) = π × r2. Bu yerda π 3,14159 qiymatga ega bo'lgan matematik konstanta va r doiraning radiusi. Agar doiraning diametri ma'lum bo'lsa, radiusni r = d / 2 formulasi orqali hisoblash mumkin.
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