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32 = 1/2 × 10 × (x+4)
32 = 5 × (x+4)
32 = 5x + 20
32 - 20 = 5x
12 = 5x
x = 2,4
b) Panjang d2 = 2,4 + 4 = 6,4 cm
Maaf kalau ada kesalahan