Final answer:
To find the distance covered in 5 rounds around a circle with a radius of 8 cm, we need to find the circumference of the circle and multiply it by the number of rounds. The correct answer is 80 cm.
Step-by-step explanation:
To find the distance covered in 5 rounds around a circle with a radius of 8 cm, we need to find the circumference of the circle and multiply it by the number of rounds. The formula for the circumference of a circle is C = 2πr, where r is the radius. So the circumference is C = 2π * 8 cm.
Since we want to find the distance covered in 5 rounds, we multiply the circumference by the number of rounds: Distance = 5 * 2π * 8 cm.
Simplifying this equation gives us Distance = 40π cm, which is approximately equal to 125.66 cm. Therefore, the correct answer is: b) 80 cm