Line ob bisects angle nod and line oa and line oc trisects angle nod and angle aob is 20 degrees less than angle noa. find the measure of angle nod and boc

Step-by-step explanation:

If lines OA and OC trisect angle NOD, then

By angle addition postulate:

If line OB bisects ange NOD, then

Angle AOB is 20 degrees less than angle NOA, then

By angle addition postulate,

Thus,

and

step-by-step explanation:

this is not possible to solve with the info given.   you need at least an one angle somewhere.

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,