[考古] 93政大國貿 求面積

[applexgreen (親愛的早安)]

Find the area enclosed by the locus if all points in the plane the sum of
whose distances from two points (-4,0) (4,0) equals 10.

請問是要找出面積的方程式嗎?
然後我一點頭緒也無...怎樣倒回來求出方程式啊Q_Q

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