Ineed to find the length of the arc

17.27 yards

Step-by-step explanation:

Length of the arc = (degree measure of the arc / 360) x (2πr)

= 90/360 x 2 x π x 11

= 1/4 x 2 x π x 11

= 11/2 x π

= 11/2 x 3.14

= 11 x 1.57

= 17.27 yards

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870