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The displacement of athelete is 141 meters from his initial point while the distance travelled by him is 471 meters.
Explanation:
The radius of the tract is 100 meter
The total circumference of a circle can be determined by the relation .:
Thus the total circumference (or distance) of the tract = 2 × 3.14 × 100
= 3.14 × 200 = 628 meters
But the athelete has completed 3/4 of the total tract, Thus the distance covered by him = 628 × 3/4 = 471 meters
To find the displacement of the athelete (which is equal to the shortest distance between his initial and final point) we take help from the diagram
(see in the pic)
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