You draw 2 diameters through the center of the circle. The 2 diameters must be perpendicular. The vertexes of the square are the 4 points where the diameters meet the circles.

square

(ii) If the diameters are perpendicular to each other, then by joining the ends of two diameters, we get a square.

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles