Find the arc length of the partial circle.

38.485(correct to 5 significant figure)/ 12.25π

Step-by-step explanation:

=38.485(cor. to 5 sig.fig.)/ 12.25π

to find arc length of sector,we need to π(radius²)(sector's degree divided by 360 degree)

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

step-by-step explanation: it is d