Question

In a circle, the lenght of an arc of central angle 40 degree is 3 pie r centimeters what is the perimeter of the circle? what is its radius?

Answer 1

Step-by-step explanation:

θ=40∘

∴ Arc length =360θ×2πr

∴4π2=36040×2πr

∴r=18cm

∴ Area of sector =21×r2θ

∴ Area of sector =21×18×18×18040πcm2

∴ Area of sector =36πcm2

∴ Area of sector =113.04cm2.

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