The endpoints of the diameter of a circle are at (1, 2) and (7, -6). What is the circumference of the circle, to the nearest tenth of a unit?
15.7
31.4
62.8
78.5
Please help?
3 answers
Is it B? 31.4?
centre is midpoint of the given line,
centre is ( (1+7)/2 , (2-6)/2 )
= (4,-2)
radius is distance from (1,2) to (4,-2)
= √(3^2 + (-4)^2)
= √25 = 5
carry on
centre is ( (1+7)/2 , (2-6)/2 )
= (4,-2)
radius is distance from (1,2) to (4,-2)
= √(3^2 + (-4)^2)
= √25 = 5
carry on
Didn't have to do what I did, thought I had to find the equation of your circle
Why not just find the length of the diameter, then
perimeter = πr
= 10π
which answer approximates that ?
Why not just find the length of the diameter, then
perimeter = πr
= 10π
which answer approximates that ?
2 answers