Penjelasan:
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Penjelasan:
1. luas segitiga = ½ × alas × tinggi
= ½ × 50 × 12,5
= 25 × 12,5
= 312,5
2. volume balok = p (panjang)× l (lebar)×t (tinggi)
= 100 × 50 × 20
=5.000 × 20
= 100.000