diameter= 2*(sqrt((4+1)^2 + (-1+3)^2)
diameter=2 sqrt(25+4)=2sqrt29
Now, A must be on the other side of B, or A is (-2,7)
How can I solve this problem?
A circle has diameter [AB]. The centre of the circle is (1,3), and B has coordinates (4,-1).
# Find the coordinates of A.
# Find the length of the diameter.
HELP ME PLEASE
4 answers
Whyγβ29 to (-2,7)?
How can I know?
How can I know?
A is the same distance from (1,3) as B is.
You don't need to know that the distance is β29. You just need to subtract the same values from (1,3) as were added to get to (4,-1)
(1,3)+(3,-4) = (4,-1)
So, you need
(1,3)-(3,-4) = (-2,7)
You don't need to know that the distance is β29. You just need to subtract the same values from (1,3) as were added to get to (4,-1)
(1,3)+(3,-4) = (4,-1)
So, you need
(1,3)-(3,-4) = (-2,7)
OK, I understand.
Thank you very much!!
Thank you very much!!
1 answer