Rainy month kaise
Triangle ABC and triangle DBC are two isosceles triangle on the same base BC and verticle A and D are
(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 skew lines for which angle between lines has no meaning as it can't be found coz they don't intersect
Question pattern in pre primary written test and interview for teacher