mohon bantuannya, kalau bisa pakai caranya ya :) maaf kalau kebanyakan (yang dijawab nomer 1-4)

1. a) keliling : 2(p+l)
=2 (8+6)
=2 (14)
= 28 cm^2
luas = p×l
= 8×6
= 48 cm^2
b) keliling = 2(p+l)
= 2(12+10)
= 2(22)
= 44
luas = p×l
= 12×10
=120
c) keliling = 2(p+l)
= 2(14+9)
= 2(23)
= 46
d) keliling = 2(p+l)
= 2(19+12)
= 2(31)
= 62
2) luas = p×l
162 = p×9
p = 162:9
= 18cm