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30 = 20
x 24
20x=30.24
x=720 = 36
20
jadi, 36-30-2=4
a = 20 cm
t = 30 cm
Didapat:
a' = a - 2p = 20 - 2(2) = 20-4 = 16 cm
Dengan konsep kesebangunan:
a/t = a'/t'
20/30 = 16/t'
2/3 = 16/t'
t' = 16 x 3/2
t' = 24 cm
Sehingga, pada sisi bawah:
x = t - (t' + p)
x = 30 - (24+2)
x = 30 - 26
x = 4 cm [C]