Brad and barb are trying to find the length of a line segment connecting two points, (x1, y1) and (x2, y2). brad uses the formula d = (x2 - x1)2 + (y2 - y1)2 . barb uses a different formula, but still gets the right answer. which formula could she have used?

step-by-step explanation :

we know that

the measurement of the outer angle is the semi-difference of the arcs which comprises

in this problem

m< xzy is the outer angle

substitute the values

the measure of angle xoy is equal to

> by central angle

substitute the value