How will the circumference of the circle change if it is dilated by a scale factor of 4? 16cm the circumference will be 4 times greater than the original. the circumference will be 16 times greater than the original. the circumference will be 1/4 the original. the circumference will be 1/16 the original.

The circumference of a circle has the formula:

C = 2 π r

Now when it is dilated by a factor of 4, this only means that the radius is also multiplied by a factor of 4, therefore the new circumference is:

C’ = 2 π (4 r)

C’ = 8 π r

So it also grows 4 times.

The circumference will be 4 times greater than the original.

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.

the anwser is d) 75°

step-by-step explanation: