If two angles are complementary, which is the sum of their measurements? a. 45o b. 90o c. 120o d. 180o

Step-by-step explanation:

An angle is a figure obtained by two rays sharing a common vertex .

Here, a ray is a line with only one end point .

A line segment is a line which has two end points .

Vertex is a point where the two lines meet .

Two angles and are said to be complementary if = .

{ For example if we take = then it's complement is = as }

So, we can say if two angles are complementary then their sum is .

Option B. is correct .

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.