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panjang = x+10
keliling = 2 (p+l)
80 = 2 (x+10+x)
80=2 (2x+10)
40= 2x +10
30=2x
15= x
lebar=15
panjang=15+10=25
luas = p× l= 25 × 15 = 375 cm²
itu menurutku, kalau salah mohon koreksinya ya