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Projection formula: Prove that a= b cos C +c cos B.

(i) Using section formula, show that the points A(-2, 3,5), B(1,2,3) and C(7,0,-1) are collinear. (ii) Using division formula, prove that the points (2,3,4),(-1,-2,1) and (5,8,7) are collinear.

Using section formula show that the points are collinear: (-2,3,5),(1,2,3),(7,0,-1)

Using section formula , show that the points A(7,-5),B(9,-3) and C(13,1) are colliner.

Using section formula show that the points are collinear: (2,-1,3),(4,3,1),(3,1,2)

Using section formula show that the points are collinear: (-1,4,-2),(2,-2,1),(0,2,-1)

By using section formula, show that the points .(1, 2, 3), (-2, 4, 2) and (7, -2, 5) are colinear

Using section formula show that the points (1,-1), (2, 1) and (4, 5) are collinear.

Using section formula,show that the points A(2,-3,4) B(-1,2,1) and are collinear.

Derive the section formula for the internal division in three dimensions.