Hi all,

Struggling with three vector questions and would appreciate if someone could help me.

http://i55.tinypic.com/2ymvsqw.png

The roof is symmetrical :)

Determine the vectorsAB,BCandCAand in each case calculate the modulus.

Find the direction cosines ofABand hence calculate the angle (correct to 1 decimal place) betweenABand each of the positive coordinate axes

Find all the angles (in degrees) in the triangle MDF, correct to 2 decimal places.

Obtain the outward unit normal vector to the sloping roof FGHC

Would really appreciate it (Hi)