Jawaban:
2 ( p - r ) 2 - ½ PQ
2 ( 2 - -1 ) 2 - ½ 2×0
2 ( 2 + 1 ) 2 - ½ 0
2 × 3 × 2 - 0
6 × 2
12
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Jawaban:
2 ( p - r ) 2 - ½ PQ
2 ( 2 - -1 ) 2 - ½ 2×0
2 ( 2 + 1 ) 2 - ½ 0
2 × 3 × 2 - 0
6 × 2
12