Question

1. A radius of a circle has endpoints (4,-1) and (8,2) and the center is at the
fourth quadrant. What are the coordinates of the center and the radius of the
circle?
A. Center (8,2): radius 5 units
C. Center (8.2); radius 10 units
B. Center (4,-1); radius 10 units
D. Center (4,-1); radius 5 units​

Answer 1

Answer:

r²=(8-4)²+(2+1)²

r²=16+9

r²=25

r=5

(x-4)²+(y+1)²=25

x²+16-8x+y²+1+2y=25

x²+y²-8x+2y-8=0