The formula is A=πr2{\displaystyle A=\pi r^{2}}, where A{\displaystyle A} equals the area of the circle, and r{\displaystyle r} equals the radius. Use algebra to get the radius r alone on one side of the equation: Use this formula to find the radius when the problem tells you the area of the circle. Substitute the area of the circle for the variable A{\displaystyle A}. Begin solving the problem by simplifying the portion under the square root (Aπ){\displaystyle {\frac {A}{\pi }})}. Use a calculator with a π{\displaystyle \pi } key if possible. If you don't have a calculator, use 3.14 as an estimate for π{\displaystyle \pi }. You will likely need a calculator to do this, because the number will be a decimal. This value will give you the radius of the circle.
सर्कल के एरिया के लिए फॉर्मूला तैयार करें: रेडियस के लिए सॉल्व करें: फॉर्मूला में एरिया डालें: एरिया को π{\displaystyle \pi } से डिवाइड करें: स्क्वेर रूट लें: