tolong yah di jawab nomor 12 dan 13

12. L persegi - L lingkaran
14 × 14 - 22/7 × 7 × 7
196-154 = 42 cm kuadrat
13. 30phi = phi × 2 × r
30 = 2 × r
15 = r
L = phi × 15 ×15
= 225 phi