tolong dijawab ya soalnya besok di kumpulin:)

No. 24
Caranya : K =(23×2) + (12×2) + 16 + 20
                    = 46 + 24 + 36
                    = 96 cm

No. 25
K = \pi × d
   = 22/7 × (21 × 2)
   = 22/7 × 42
   = 132 cm

No. 26
30×2 + 16 + {(22/7 × 8)÷2}
60 + 16 + 50,28
126,28

No. 27
K persegi = sisi × 4
                = 14 × 4
                = 56
56 × 8 = 448
500 - 448 = 52