Ineed answering this question pls what is the measurements.

21 degrees.

Step-by-step explanation:

Let m1 be one unit. Hence, m2 will be four units.

Since m2 is four times of m1, the total number of units will be 4+1=5.

Thus,

To find m1 which is 1 unit, we basically divide 105 by 5.

Angle m1 is 21 degrees.

so the right answer is of option B

Look at the attached picture ⤴

Hope it will help u...