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kll= 2p + 2L
80= 2(10+L)+2L
80= 20+2L+2L
80= 20+ 4L
-4L= 20-80
-4L=-60
L= -60/ -4
L= 15
P= 10+15
P= 25
Luas = 25 X 15
=375cm pangkat2
Terima kasih
K = 2p . 2l
80 cm = 2l + 2(l+10cm)
80 cm = 2l + 2l + 20cm
80 cm = 4l + 20cm
80 cm - 20 cm = 4l
60 cm = 4l
60 cm / 4 = l
15 cm = l
p = l + 10cm
p = 15cm + 10cm
p = 25cm
L = 25 cm . 15 cm
= 375 cm2