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l = 30 m
Luas = P x L
= 45 m x 30 m
= 1350 m² = a
17). Luas = 625 m²
Luas = s x s = s²
625 = s²
s = √625
s = 25 m
Keliling = 4 x s
Kll = 4 x 25
= 100 m = b
18). S = 15 cm
Keliling = 4 x s
Kll = 4 x 15
Kll = 60 cm = b
19) c = 2 x luas segitiga
karena :
Luas Persegi : Luas Segitiga
= S x S : 1/2 a x t (a = t = s)
= S x S : 1/2 S x S
jadi luas persegi = 2 kali luas segitiga