Answer:
30
Step-by-step explanation:
20 divided by 12 is 5/3.
18x5/3 is 30, meaning the missing side is 30.
23°
Hope this helps you! Have a great day. :)
10.5 cm
area of parallelogram = Bh
12 x 7 = AB x 8
AB = 12x7 / 8 = 21/2 = 10.5