What is the measure of the highlighted (middle) angle, in degrees?

Step-by-step explanation:

5x + 2x + 67.3° = 180° { being linear pair }

7x = 180° - 67.3°

7x = 112.7°

x = 112.7°/7

x = 16.1°

Now

5x = 5 * 16.1 = 80.5°

Hope it will help :)

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

12

step-by-step explanation: