Tuliskan rumus luas juring (sektor). Masukkan luas juring dan sudut juring ke dalam rumus. Bagi sudut juring dengan 360. Pisahkan (π)(r2){\displaystyle (\pi )(r^{2})}. Bagi kedua sisi persamaan dengan π{\displaystyle \pi }. Akarkan kedua sisi.

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The formula is Asector=θ360(π)(r2){\displaystyle A_{sector}={\frac {\theta }{360}}(\pi )(r^{2})}, where Asector{\displaystyle A_{sector}} equals the area of the sector, θ{\displaystyle \theta } equals the central angle of the sector in degrees, and r{\displaystyle r} equals the radius of the circle. This information should be given to you. Make sure you have the area of the sector, not the area for the circle. Substitute the area for the variable Asector{\displaystyle A_{sector}} and the angle for the variable θ{\displaystyle \theta }. This will tell you what fraction of the entire circle the sector represents. To do this, divide both sides of the equation by the fraction or decimal you just calculated. This will isolate the r{\displaystyle r} variable. For a more precise result, use a calculator. You can also round π{\displaystyle \pi } to 3.14. This will give you the radius of the circle.