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L = × a × t
24 = × (3x-1) × 2x
2.24 = (3x-1) × 2x
48 = (3x-1) × 2x
x = 3cm
maka :
alas = (3x-1)
= 3.3-1
= 8cm
tinggi = 2x
= 2.3
= 6cm
sisi miring = 3x+1
= 3.3+1
= 10cm
keliling = alas + tinggi + sisi miring
= 8+6+10
= 24cm