# 3 - Vector and 3 D Questions Answers

Is area always a vector quantity or it can be a vector quantity?

**Asked By: AMIT DAS**

is this question helpfull: 3 1

**submit your answer****Joshi sir comment**

generally it is scalar but in the measurement of flux through a surface it is considered a vector perpendicular to the surface with same magnitude

line AB intersects CD internally in the ratio K : 1 where K is undefined , these line may be ( 1) concurrent , (2) intersecting , (3) skew < (4) all of these . explain plese ?

**Asked By: SHUBHAM VED**

is this question helpfull: 4 0

**submit your answer****Joshi sir comment**

I think it will be skew because skew lines do not intersect in real points

show that line perpendicular to x-axis and a line perpendecular to y-axis having slope multipication -1

**Asked By: HARISH**

is this question helpfull: 13 1

**submit your answer****Joshi sir comment**

Angle between two lines is given by the formula

tanθ = (m_{1}-m_{2})/(1+m_{1}m_{2})

solve this by taking θ = 90