Odpowiedzi

2009-11-24T15:01:20+01:00
A ) 150/360 × 2πr = ½π
5/12 × 2πr = ½π / ÷2π
5/12r = ½π × ½π
5/12r = ¼π² / ×4
5/3r = π² / ÷5/3
r = ⅗π
2 3 2