22 sampai 24 besok dikumpulin

22 ) Keliling = π × d
= 3,14 × 50
= 157 cm

23 ) Luas = a × t
= 25 × 12
= 300 cm2

24 ) Luas = 1/2 × π × r × r
r = 14 ÷ 2 = 7 cm

Luas = 1/2 × 22/7 × 7 × 7
= 77 cm2