yakni …. cm
Jawaban:
Luas 
= πr²
= πr²3.850 = 22 . r²
7
r² = 3.850 × 7 ÷ 22
r = √1225
r = 35 cm
Keliling = 2 × π × r
= 2 × π × r = 2 × 22 × 35
7
= 44 × 5
= 220 cm
Makara, keliling bulat = 220 cm