Q1 of 138 Page 24

What is the angle between vectors and with magnitudes 2 and √3 respectively? Given

We know,

where θ is the angle between a⃗ and b⃗.

Given, |a|=2 |b|=√3

So,

θ = 60°

If the median to the base of a triangle is perpendicular to the base, then the triangle is isosceles.

In a quadrilateral ABCD, prove that AB² + BC² + CD² + DA² = AC² + BD² + 4PQ² where P and Q are middle points of diagonals AC and BD.

If are two vectors such that Write the projection of on

Find the cosine of the angle between the vectors and