Q. 24.2( 29 Votes )
Find the lengths
Answer :
Given: The vertices of the triangle are A (0, 0, 6), B (0, 4, 0) and C (6, 0, 0).
⇒ x1 = 0, y1 = 0, z1 = 6; x2 = 0, y2 = 4, z2 = 0; x3 = 6, y3 = 0, z3 = 0
We know that the median is a line segment through a vertex of a triangle to the midpoint of the side opposite to the vertex.
So, let the medians of this triangle be AD, BE and CF corresponding to the vertices A, B and C respectively.
⇒ D, E and F are the midpoints of the sides BC, AC and AB respectively.
By Midpoint Formula, we know that the coordinates of the mid-point of the line segment joining two points P (x1, y1, z1) and Q (x2, y2, z2) are .
So, we have
The coordinates of D = (3, 2, 0)
The coordinates of E = (3, 0, 3)
And the coordinates of F = (0, 2, 3)
By Distance Formula, we know that the distance between two points P (x1, y1, z1) and Q (x2, y2, z2) is given by .
The lengths of the medians are:
So, the lengths of the medians of the given triangle are 7, and 7.
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