The groundsman has to mark a circle of 10 m diameter on the playing field .he has a wooden peg and a ball of string. describe how he does it

The groundsman can pound the stake into the ground.  He can then, take the string and tie it loosely to the stake (making sure it can still turn around the stake), and measure the length to 5 feet, or the radius of the circle.  The groundsman can then walk in a circle and mark it.

He  hammers the pin into the ground and attaches 5m of string 

He can then circle the pin with the string taut and mark the circle in the ground

He must use 5m of string beacuse the diameter  must be 2*5 = 10 m.

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.

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