解答

For your reference

Annie❤️

請問第一個式子等號後的
1/2(2^2+根號20^2)是指什麼?

Call me Bravo

Midline rule? Let (x,y)-center be the middle line

Annie❤️

那個2^2是為什麼?

Call me Bravo

Check the picture

Annie❤️

謝謝你的圖
但是我還是不知道2^2是在算哪裡?

Call me Bravo

The middle point (x,y) between any point on the circle and the point P. 2 is the radius that is distance between any point and the center of the circle.

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