Well, isn't that a lovely question! Let's see here, if we have a 4.5m rope and we want to cut it into 25cm lengths, we simply need to divide the total length of the rope by the length of each piece. So, 4.5m is equal to 450cm, and when we divide 450cm by 25cm, we find that we can cut 18 pieces of 25cm length from the rope. Happy little calculations!
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-45m + 68 = 84m - 61 39m = 7 m = 7/39
No
No it is not. 4500 km are equal to 4,500,000 meters.
Perimeter = 2*(40m + 5m) = 2*45m = 90m
The lengths of two sides are not enough to determine the perimeter of a triangle: Either the third side or else the angle between the two given sides is also needed. If two of the sides are 10m and 25m, then the third side can be anything between 15m and 35m, and the perimeter can be anything between 45m and 70m.