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In the straight triangular prism abc-a1b1c1, Aa1 = BC = AB = 2, AB is perpendicular to BC, find the size of dihedral angle b1-a1c-c1, which two planes are b1-a1c-c1?
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In the straight triangular prism abc-a1b1c1, Aa1 = BC = AB = 2, AB is perpendicular to BC, find the size of dihedral angle b1-a1c-c1, which two planes are b1-a1c-c1?
Just type a word. I already know it,
No one wants points
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