Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
+1 vote
1.1k views
in Vector algebra by (36.3k points)

Two adjacent sides of a parallelogram ABCD are given by AB = 2i + 10j + 11k and AD = –i + 2j + 2k. The side AD is rotated by an acute angle a in the plane of the parallelogram so that AD becomes AD'. If AD' makes a right angle with the side AB, the cosine of the angle a is given by 

1 Answer

+1 vote
by (33.0k points)
selected by
 
Best answer

Answer is (b) √17/9

Explanation:

Let θ be the angle between AB and AD.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

...