Question

Find the length of the diameter of the circle having centre at (-3, 6) and passing through
P(1, 3)​

Answer 1

Answer:

10 units

Explanation:

Formula of a circle :

(x - a)^2 + (y - b)^2 = r^2

where (a,b) is the center and (x,y) is any point on the curcumference

a = -3

-a = 3

b = 6

-b = -6

x = 1

y = 3

So

(1 +3)^2 + (3 - 6)^2 = r^2

r = sqr root(25)

r = 5

Therefore diamtere = 2 * 5

= 10 units