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The answer is B.

Step-by-step explanation:

Since we can assume these are vertical angles, m+20 has to equal 100.We can put that in an equation m+20=100 and solve. You move the 20 over and m=80.

34.5 cm

step-by-step explanation:

generally for a circular segment of angle, θ° and radius r

arc length

= (θ/360) x circumference

= (θ/360) x 2πr

in our case, θ = 60°, π=3.142 and r = 33 cm

substitute into above formula

arc length

= (60/360) x 2(3.142)( 33) = 34.5 cm