Tentukan nilai c dan d

(12 + c) / 12 = 11 / 8
8 ( 12 + c) = 12. 11
96 + 8 c = 132
8 c = 132 – 96
8 c = 36
c = 36 / 8
c = 9 / 2
c = 4,5 cm

d / 15 = 11 / 8
8 d = 15. 11
d = 165 / 8
d = 20,625