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4s=64
s=16 cm
luas alas= 16×16= 256 cm kuadrat.
t = 15cm
Keliling alas = 64cm
Ditanya : Luas alas?
Jawab :
Keliling alas = 4 x rusuk
64 = 4r
r = 16cm
Luas alas = rusuk x rusuk
= 16 x 16
= 256cm²