Question

Converse of Bpt 

(https://www.teachoo.com/3504/753/Ex-11.2--2---Show-line-(1---1--2)--(3--4---2)-is-perpendicular/category/Ex-11.2/) 

But 1st we need to prove that lines are intersecting one's coz in 3d we have possibility of skew lines for which angle between lines has no meaning as it can't be found coz they don't intersect. 

1. 11th class kee maths ncrt ki exercises 15.1

mid point theoram orve

I have a suggestion for Q17 in ncert class 11 complex numbers and quadratic equations miscellaneous exercises on chapter 5

(Please bear with me for the image quality)

If we proceed in this way the answer would come quicker

Please let me know how to do in it 

Let R be the relation on the set N of natural numbers defined by R={(a,b):a+3b=12,a,bEN}

Please help me with this

Bank a/c is a personal a/c or a real a/c?

A cone of height 24cm and radius of base 6cm is made of modelling clay. A child reshapes it in form of a sphere . Find radius of sphere