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3000 miles = 190,080,000 inches = adjascent

1/2*3 inches = 1.5 inches = opposite (iscossolise tryangle = 2 right angle tryangle back to back)

tan = opposite/adjascent = 1.5/190,080,000 = 7.8914141414141414141414141414141e-9

tan-1 7.8914141414141414141414141414141e-9 = 4.5214472469288446723046398893908e-7 degrees*2 (back to iscosolies tryangle)= 9.0428944938576893446092797787816 e-7

so 0.000,000,9 degrees, assuming your measurements are accurate

Q: What is the angular diameter of an object that has a linear diameter of 3 inches if it is at a distance of 3000 miles?

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