Question

how do i find the measure of JAR in degrees

Answer 1

Angles on a straight line add up to 180 so take 91 away from  180 to give you 89 i guess ^^; i hope that helps somewhat 

Answer 2

Line $\bar{DG}$ is a straight line, that means that it its angle is $180˚$.  That means 2 angles must add up to $180˚[tex].  This is called the complementary angle property.  An example is below as an image. If the two angles must add up to [tex]180˚$, and one is $92˚$, you can find $\measuredangleJAR$ by doing:

180-92=

[tex]88˚/tex]