Tolong dijawab sama caranya no 11-15

11) K = 4s = 4*s
K = 4*4 = 16
L = s² = s*s
L = 4² = 16

12) K = 140
S = 140 ÷ 4 = 35
L = 35² = 1225

13) p = 124
l = 124 x 1/2 = 62
L = 124 x 62 = 7688

14) L = 20 x 15 = 300

15) S persegi a = 48 ÷ 4 = 12
S persegi b = 56 ÷ 4 = 14
L persegi a = 12² = 144
L persegi b = 14² = 196
144 < 196