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∠APB ≥ 30°
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
A(0,0,6), B(0,0,20), P(x,y,0)。若 0≤ x ≤ 15, 0 ≤ y ≤ 15, ∠APB ≥ 30°,求 P 點軌跡所形成的圖形面積。
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