Tuklasin kung paano ka matutulungan ng IDNStudy.com na makuha ang mga sagot na kailangan mo. Hanapin ang mga solusyong kailangan mo nang mabilis at tiyak sa tulong ng aming mga bihasang miyembro.

3. Which of the following is the 1 point
equation of a circle in general
form if the center is at (1, 2) and
radius of 5 units? *
A. x^2 + y^2 + 2x + 4y - 30 = 0
B. X^2 + y^2 + 2x + 4y - 20 = 0
Ο Ο Ο Ο
O C.x^2 + y^2 - 2x - 4y - 30 = 0
O D. x^2 + y^2 - 2x - 4y - 20 = 0​


Sagot :

Answer:

D. x² + y² -2x -4y - 20 = 0

Step-by-step explanation:

center is at (1, 2) and radius of 5 units

(x-h)² + (y-k)² = r²

(x-1)² + (y-2)² = 5²

(x-1)(x-1) + (y-2)(y-2) = 25

x² -2x +1 + y² -4y +4 = 25

x² -2x + y² -4y +4 + 1 - 25 = 0

x² -2x + y² -4y +5 - 25 = 0

x² -2x + y² -4y - 20 = 0