The angle of lines

Calculate the angle of two lines y=x-21 and y=-2x+14

Correct result:

α =  -108.4 °

Solution:

α=180πarctan(211+1(2))=108.4\alpha = \dfrac{180}{\pi} \arctan( \dfrac{ -2 -1}{ 1+1\cdot (-2)}) = -108.4 ^\circ



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