Check and discuss the above relations in the case of angle between `0^(@) and 90 ^(@) ` whether they hold for these angles or not?

Angle between vec(a) and vec(b) is 60^(@) then

The measure of the angle of intersection between y^(2)=x and x^(2)=y other than one at (0, 0) is …………

If vecP*vecQ=0 , then angle between vecP and vecQ is 0^@ .

Find measure of an angle between the lines x = 3 and 2x - y - 5 = 0

The angle of contact between drop of water and material of raincoat is acute angle.

If vecP.vecQ=PQ then angle between vecP and vecQ is

If vecA+ vecB = vecC and A+B+C=0 , then the angle between vecA and vecB is :

The measure of the angle between pair of lines x=y and y=0 is …………..

A man walking briskly in rain with speed v must slant his umbrella forward making an angle theta with the vertical. A student derives the following relation between theta and v: tan theta = v and checks that the relation has a correct limit : as vtoo, thetato0 , as expected , (we are assuming there is no strong wind and that the rain falls vertically for a stationary man.) Do you think this relation can be correct ? If you, guess the correct relation.

The angle between vectors (hati+hatj) and (hatj+hatk) is :