What is the length of the arc if: 11. r=10 n=20 a15(pi)/ 7 b13(pi)/ 5 c16(pi)/ 2 d11(pi)/ 4 e 10(pi)/ 9 f 9(pi)/ 4 12. r=3 n=6 api/9 bpi/12 cpi/26 dpi/10 e pi/8 f pi/4 13. r=4 n=7 a8(pi)/55 b 6(pi)/12 c7(pi)/45 d2(pi)/22 e 9(pi)/18 f 7(pi)/37 14. r=2 n=x ax(pi)/15 bx(pi)/30 cx(pi)/60 dx(pi)/90 e x(pi)/120 f x(pi)/150 15. r=y n=x a x*y*pi/90 bx*y*pi/30 cx*y*pi/45 dx*y*pi/27 e x*y*pi/180 f x*y*pi/115

Step-by-step explanation:

The formula for arc length [for the angle in degrees] is:

here,

= degrees

= radius

using this we'll solve all the parts:

r = 10, n = 20:

from here, it is just simplification:

2 and 360 can be resolved: 360 divided by 2 = 180

10 and 180 can be resolved: 180 divided by 10 = 18

finally, both 20 and 18 are multiples of 2 and can be resolved:

Option (E)

r=3, n=6:

Option (D)

r=4 n=7

Option (C)

r=2 n=x

Option (D)

r=y n=x

Option (E)

c is the answer

step-by-step explanation:

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.