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ok can you guys help me on this question: The sun subtends an angle of about .5 degrees to us on the earth, 150 million km away. what is the radius of the sun?
I know how you can find the answer, but I don't understand why you have to multiply the sun's radius by 2...
Please answer soon!

This is just geometry and not really physics. All you have to do is find the arc length that the sun takes up in a circle with a radius equal to 1 AU. Convert .5* to radians and multiply by 1 AU, the radius. That gives you the diameter of the sun, divide by two to get the radius.