The Sun's diameter is approximately 1,391,000,000 meters in length, which is over 100 times the approximate diameter of the Earth (12,756,200 meters).
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This is a simple algebra problem. The Sun has a diameter of 1,390,000 km, and the Earth has a diameter of 12,756 km. If I'm making a model of the Sun that is 1.26 meters in diameter, what should the diameter of the model Earth be? So, 12756/1390000*1.226 = 0.0112509755 meters, or 1.125 cm. So, if the sun-model is 1.26 meters, about the size of a bicycle wheel, then the earth-model is about the size of a pea.
The circumference of a circle with a diameter of 13.4 meters is: 42.1 meters (diameter x Pi = circumference).
diameter = 220/pi meters
The radius of a circle is 1/2 of its diameter. If the diameter is 15 meters, then the radius is 7.5 meters.