Tolong Dong No 25 - 26

24)
r = 28 cm
phi = 22/7

L daerah yang diarsir
= 3/8 × phi × r^2
= 3/8 × 22/7 × 28 × 28
= 924 cm^2 (b)

25)
K = (2 × 12) + (10 × 2) + (3,14 × 10)
K = 24 + 20 + 31,4
K = 75,4 cm (d)