Question

Yun

求第二題算法🙏

1. (
2. (3)
)假設a>0,坐標平面上,圓x+y²-2ax-2by+9=0與y軸相切於 4(0,-3),
且半徑為4,則求a=? (A)1 (B)2 (C)3 (D)4 (E)5
) 圓x+y²−2x+4y-3=0與直線x+by+5=0相切於 P(-1,4),則a+b之值為
(A)l (B)2 (C)3 (D)4 (E)5 (x-\)*f(y+2)*=3+1+4
150r = 58
(1,-2)

Answer 1

兔

直線到圓心的距離等於半徑