elena cycled to school. find the distance travelled by elena if her bicycle wheels rotated 840 times and the radius is 0.25 m.
Answers
Answer:
1318.8m
Step-by-step explanation:
1. we calculate circumference(2πr) and then 1.57 multiplied by 840
Answer:
1318.8 meters (1 kilometer and 318.8 meters)
Step-by-step explanation:
The answer would be the circumference of the wheel times how many times it rotated. The equation for circumference is C = πd, where C is circumference and d is diameter. Diameter is 2r, where r is the radius. So the diameter is 2(0.25m), or 0.5m. Plug that diameter into the equation for circumference, and you have C=π(0.5m). So the circumference is π times 0.5m. Let's estimate π as 3.14. 3.14 times 0.5 is 1.57. So the circumference is 1.57. Now let's multiply the circumference by 840 to find the distance she traveled. 1.57 times 840 rotations of Elena's wheels is 1318.8. So she traveled 1318.8 meters, or 1 kilometer and 318.8 meters. Hope that helped!