pls kindly tell how the length of L is like this. thank you very much
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Originally Posted by helloying pls kindly tell how the length of L is like this. thank you very much 1. You first have to prove that the two angles marked in yellow are equal.
2. Calculate the red line in the lower right triangle and afterwards the blue line in the upper right triangle. The length of L is the difference of these two distances.
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