If the radius of a circle is 8.1 mi, what is the circumference?
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206.12 mi

Step-by-step explanation:

A=πr²=π·8.1²≈206.11989

∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.