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A(0,1,0)C(1,0,0)B(1,1,1)AC= (-1,1,0)BC = (0,1,1)CosC = 1/sqrt(2)^2 = 1/2C = 60The other way: notice that it is equilateral triangle formed by diagonals. Hence, 60
Good job guys. And blaoism, yes, the best way of looking at it is to see that ABC is equilateral so the angle will equal 60. And yeah, this is a real tough guy, until someone tell you how to do it! Then it iseems obvious, right?
A(0,1,0)
ReplyDeleteC(1,0,0)
B(1,1,1)
AC= (-1,1,0)
BC = (0,1,1)
CosC = 1/sqrt(2)^2 = 1/2
C = 60
The other way: notice that it is equilateral triangle formed by diagonals. Hence, 60
Good job guys. And blaoism, yes, the best way of looking at it is to see that ABC is equilateral so the angle will equal 60. And yeah, this is a real tough guy, until someone tell you how to do it! Then it iseems obvious, right?
ReplyDelete