Keliling = 80cm
Keliling cermin = Kel.persegi = 4 x s = 80 maka ;
-------------------------------------------------> s = 80/4
-------------------------------------------------> s = 20cm
k = 4 × s
80 = 4 × s
80 = 20
sisi = 20 cm
jadi panjang sisinya adalah 20 cm
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Keliling = 80cm
Keliling cermin = Kel.persegi = 4 x s = 80 maka ;
-------------------------------------------------> s = 80/4
-------------------------------------------------> s = 20cm
➡️Jawab
k = 4 × s
80 = 4 × s
80 = 20
sisi = 20 cm
jadi panjang sisinya adalah 20 cm