tolong yahhh di jawab yg bener

K = 2(p + l)
80 = 2 (5x + 3x)
80 = 2(8x)
80/2 = 8x
40 = 8x
x = 5

p = 5 . 5
p = 25 cm

l = 3 . 5
l = 15 cm

L = p x l
L = 25 x 15
L = 375 cm​​​​​​​²

semoga membantu!