We need to get the units the same, before adding. 1 km = 1000 m, so multiply (5 km) x (1000 m/km) = 5000 m. Now you can add 5000 m + 10000 m = 15000 meters.
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First you must know the radius of whatever is moving in a circle. The relationship is: linear speed (meters/second) = angular speed (radians/second) x radius. The result, as hinted in the units, will be in meters/second. Converting that to meters/minute is easy; you just multiply by 60.
The perimeter of the first one is 12 + 4 + 12 + 4 = 32 The perimeter of the second one is 13 + 3 + 13 + 3 = 32 So, yes, their perimeters have the same length.
revolutions are angular velocity (w), so you need to know radius (r) to convert to velocity (v) meters per second. not linear velocity. v = wr. For example 30 revs per min is 30/60 revs per second; over a 2 meter radius velocity is 30/ 60 x 2 = 1 meter per second
first you have to convert the 6 mins to seconds 60 x 6 = 360 + 35 = 395 sooo 8550/395 = 21.65 m/s
The perimeter of 4 meters by 5 meters is 18. Is the figure a square? if it is then the answer is 18m squared. The first answer is correct if the shape is a parallelogram; the second is rubbish. A square cannot be 4m by 5 m because one of the defining characteristics of a square is that its sides are the same length! The perimeter is the length (therefore metres, NOT m sq) around the shape. 4m+5m+4m+5m = 18m.