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panjang = 3 + l
K = 30
bagian a. :
K = 2 x (p+l)
30 = 2 x (3 + l + l)
30 = 2 x (3+2l)
30 = 6 + 4l
b. panjang dan lebar
4l = 30 - 6
l = 24/4
l = 6 cm
jadi lebar = 6 cm
panjang = 3 + l = 3 + 6 = 9 cm
c. Luas = p x l
= 6 x 9
= 54 cm²