а) D = √((2+4)² + (-1-7)²) = √(6²+(-8)²)= √(36+64) = √100= 10
б) O = ((-4+2)/2) ; (7-1)/2) = (-1; 3)
в) R = D/2= 10/2 = 5
(x+1)² + (y-3)² = 25
а) D = √((2+4)² + (-1-7)²) = √(6²+(-8)²)= √(36+64) = √100= 10
б) O = ((-4+2)/2) ; (7-1)/2) = (-1; 3)
в) R = D/2= 10/2 = 5
(x+1)² + (y-3)² = 25