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19.]
SPLDV yg berkaitan adalah :
x + 2y = 94000 dan 2x + 3y = 167000 [A]

20.]
BC² = AB² + AC²
BC² = 20² + 21²
BC² = 841
BC = √841
BC = 29 cm [D]

21.]
BC = AD = 15 cm

BD² = CD² - BC²
BD² = 25² - 15²
BD² = 400
BD = √400
BD = 20 cm [B]

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