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hElP w/Radians&Degrees

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The diameter of the sun is 1.39x10^9 m, and it is 1.5x10^11 m from the earth. When viewed from earth what is the angle from one side of the sun to the other? Give answer is Radians and Degrees.


My problem is the qusetion also states do NOT use sine, cosine, or triangles to solve this.


My attempt was to think in spheres from one to the other drawing lines to connect the two, but then that results in a triangle.

HINT: the ANGLE is very small

TIA
 

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