Ruby2480
06.03.2020 •
Mathematics
A train moving at a speed of 60km/hour covers a distance in 7.5 hours . What should be the speed of the train to cover the same distance in 6 hrs .
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Ответ:
628.3 cm
Step-by-step explanation:
The window has a semicircle shape = half of a circle
Perimeter of the window = ½(πr²)
Radius (r) = 20 cm
Plug in the value
Perimeter of the window = ½(π*20²)
= ½(π*400)
Perimeter of the window = 628.31853 ≈ 628.3 cm (nearest tenth)