Which of these angles is the greatest if A (-2; -1; 2), B (-2; 2; -1), C (1; -1; 5), D (0; -3; 0).

univerkov | September 8, 2021 | education

Find the coordinates of vectors AB and AD:

AB = ((-2 – (-2)); (2 – (-1)); (-1 – 2) = (0; 3; 3);

AD = ((0 – (-2); (-3 – (-1); (0 – 2) = (2; -2; -2).

cos (BAD) = (AB * AD) / | AB | * | AD |.

The rest of the angles must be calculated in the same way.

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