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2(p + l) = K
2((l + 5) + l) = 30
2(l + 5 + l) = 30
2(2l + 5) = 30
4l + 10 = 30
4l = 30 - 10
4l = 20
l = 5
Jadi lebar persegi panjang adalah 5 cm.
30=2(5+L+L)
30=2(5+2L)
30=10+4L
20=4L
5=L
P=5+L
P=10
P=10cm
L=5cm