Use the fact that the length of an arc intercepted by an angle is proportional to the radius to find the arc length given the circle area a = 9π cm2 and θ = π/4 .

arc length = 3π/4 cm

The appropriate relations are ...

... A = πr² . . . . area of a circle

so ...

... r = √(A/π)

and

... s = rθ . . . . . arc length

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Combining these, we have

... s = θ√(A/π)

Filling in your numbers gives ...

... s = (π/4)√((9π cm²)/π)

... s = 3π/4 cm

1; 35 is the ratio

step-by-step explanation:

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