Final answer:
To find the missing measure m1, use the fact that the sum of angles in a triangle is 180°.
Step-by-step explanation:
In the given question, we need to find the missing measure m1. We are given that m2 = 2x° and m3 = 5x°. To find m1, we need to use the fact that the sum of angles in a triangle is 180°. So we have:
m1 + m2 + m3 = 180°
Substitute the given values:
m1 + 2x + 5x = 180°
Combine like terms:
m1 + 7x = 180°
Now solve for m1 by isolating it:
m1 = 180° - 7x