Prove that the diagonal of a parallelogram is trisected by the straight lines joining with the midpoints of the opposite sides.
Showing posts with label triangle. Show all posts
Showing posts with label triangle. Show all posts
Prove that the straight lines joining the mid-points of the opposite sides of a quadrilateral bisect each other.
Show that the straight line joining the mid points of two sides of a triangle is parallel to third side and is half as long. Let ABC be a...
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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.
