Question

Write a standard equation of the circle(please specify which answer is for which)

Answer 1

21.
the equation of a circle with center at (h,k) and radius r is
(x-h)²+(y-k)²=r²

so
(x-1)²+(y-2)²=5²
(x-1)²+(y-2)²=25


22.
the equation of a circle with center at (h,k) and radius r is
(x-h)²+(y-k)²=r²

so
(x-(-3))²+(y-5)²=2²
(x+3)²+(y-5)²=4