Can you say what angle is made by the two red lines drawn on two sides of the cube as shown in the illustration?
the red lines form two sides of a triangle. Each red line is equal to ”ī(2*side of cube©÷). The immaginary third side of the triangle is also this length, as it is also a diagonal of one side of the cube. Therefore all sides are equal in the triangle. Therefore each angle in the triangle is equal, therefore one angle is 60 degrees.
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