Prove that four diagonals of a parallelepiped and the straight lines joining the midpoints of opposite edges are concurrent at the point ...
Showing posts with label parallelepiped. Show all posts
Showing posts with label parallelepiped. Show all posts
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Show that the vectors 5a + 6b + 7c, 7a - 8b + 9c, 3a + 20b + 5c are coplanar. Where a, c, and c are non-coplanar. -
Prove that the four points 2a + 3b - c, a - 2b + 3c, 3a + 4b -2c and a - 6b + 6c are coplanar, where a, b, c are no-coplanar Prove t... -
If a and b are unit vectors and θ is the angle between them, then how do I prove that sin θ/2 = ½ |a-b|? -
Prove that the three points -2a + 3b + 5c, a + 2b + 3c and 7a - c are colinear, where a, b, c are non-coplanar.
