Answer:
x² + y² = 841
Explanation:
Midpoint of diameter is a center of a circle.
Coordinates of midpoint are
(
,
)
(
,
)
(
,
)
d =
Equation of a circle with center at (h, k) and radius "r" is (x - h)² + (y - k)² = r²
~~~~~~~~~~
C(20, 21)
D(- 20, 21)
(
,
) = (0, 0)
d =
= √3364 = 58
r =
= 29
x² + y² = 29²
x² + y² = 841