How To Find The Radius Of A Circle?

If you know the diameter: radius = diameter ÷ 2

If you know the circumference: radius = circumference ÷ (2π)

If you know the area: radius = √(area ÷ π)

Use the Pythagorean theorem for a right triangle: (a^2 + b^2 = c^2)

Solve for the missing side by rearranging the formula

If the hypotenuse is missing: (c = sqrt{a^2 + b^2})

Use the distance formula: (d=sqrt{(x_2-x_1)^2+(y_2-y_1)^2})

For 3D points, use: (d=sqrt{(x_2-x_1)^2+(y_2-y_1)^2+(z_2-z_1)^2})

Identify the coordinates of both points

Use the periodic table trend: atomic radius generally increases down a group and decreases across a period from left to right

Measure the distance between the nuclei of two identical bonded atoms and divide by two

For nonbonded atoms, use X-ray crystallography or electron diffraction data to estimate atomic size

Use the diameter: radius = diameter ÷ 2

Use the circumference: radius = circumference ÷ (2π)

Use the area: radius = √(area ÷ π)

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