no 3&4 tolong jawab pakai cara

3.)

k = 132
r = 132 ÷ 22/7 = 132 × 7/22 ÷ 2 = 21
L = 22/7 × 21 × 21 = 1386 m2

4.)

Luas persegi = 42 × 42 = 1764 cm2
Luas lingkaran = 22/7 × 21 × 21 = 1386 cm2
luas yg diarsir = 1764 - 1386 = 378 cm2