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saya anggap sisinya adalah x
sehingga :
4x = 8x - 20
4x-8x = -20
-4x = -20
x = 5 cm
Luas persegi = s.s
= 5.5 = 25 cm²
2.) Difaktorkan, sehingga :
maaf kalau salah
(8x-20) = 4 sisi
sisi =
sisi = 2x-5
x = 2,5 cm
Maka luas persegi
L= S * S
L= 2,5 * 2,5
L= 6,25
2.
=
=