Well we can find the perimeter by using the formula P=2L + 2W P=2(30) + 2(18) P=60+36 P=96 I believe we can divide the perimeter by 18 to find the total amount of lights needed. 96÷18=5.333333 So we know at least 5 lights are needed. I'm not sure if I'm correct, but I hope this helped anyways :)
for Earth it is 2.16 mm and Venus is 100.9 mm Pluto it is 250. millimeters make me it is 5.6 mm Mars it is 2.9 mm Sun it is 6.10 MM Jupiter it is a 70.10 MM of Saturn it is 25.8 MM Uranus it is 15.6 mm It Is 96.9 mm