Question

What is the endpoint formula given midpoint?

Answer 1

B = 2M -A

Explanation:

For given endpoint A and midpoint M, the other endpoint B can be found using the definition of the midpoint:

M = (A+B)/2

2M = A+B . . . . . multiply by 2

2M-A = B . . . . . subtract A

The second endpoint can be found by subtracting the given endpoint from twice the midpoint:

B = 2M -A