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Verified answer
L=1/2(a+b)xta+b=L:1/2t
=450 :1/2 x20
= 450:10
=45 cm
a+b=45 cm
30+b=45
b=45-30
b=15 cm
adi sisi lainnya = 15 cm
450 = 1/2 × ( 30 + b) × 20
450 × 2= (30+b ) × 20
900 = 600 + 20b
900 - 600 = 20b
300 = 20b
b = 300/20
b = 15 cm
jadi, sisi sejajar yang lain adalah 15 cm