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2(L+5) + 2L= 70..
4L+10=70
4L=60... L=15cm...P=20
Luas = P x L
Luas = 20 x 15=300 cm2
p = lebar + 5
70 cm = 15 + 15 + 20 + 20
luas = 15 x 20 x cm²
luas = 300 cm²
mohon dikoreksi lagi, mungkin salah