PLEASE HELP ! .
Naher has a mirror in a shape of a circle.
The circle has a diameter of 60 cm.
Naher buys metal strips to put around the edge of the mirror.
The metal strip is sold in lengths of one meter.
Each one meter length of metal strip costs £5.68
Work out the total amount Naher paid.

£323.76

Step-by-step explanation:

Circumference = 2πr

= 2 x π x 30^2

= 2 x π x 900

= 1800π = 5654.9 cm = 56.549 meters

Amount paid 57m x £5.68 = £323.76

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.

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer