- Data Structure
- Networking
- RDBMS
- Operating System
- Java
- MS Excel
- iOS
- HTML
- CSS
- Android
- Python
- C Programming
- C++
- C#
- MongoDB
- MySQL
- Javascript
- PHP
- Physics
- Chemistry
- Biology
- Mathematics
- English
- Economics
- Psychology
- Social Studies
- Fashion Studies
- Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Prove that two lines are respectively perpendicular to two parallel lines , they are parallel to each other.
Given:
Two lines m and n are parallel and another two lines p and q are respectively perpendicular to m and n.
Or 𝑝⊥𝑚 and 𝑝⊥𝑛,𝑞⊥𝑚 and 𝑞⊥𝑛
To prove: 𝑝∥𝑞
Proof:
Since, 𝑚∥𝑛 and p is perpendicular to m and n.
So,
p is perpendicular to m …(i)
p is perpendicular to n …(ii)
Since, 𝑚∥𝑛 and q is perpendicular to m and n.
So,
q is perpendicular to m …(iii)
q is perpendicular to n …(iv)
From the equations (i) and (iii) [or from (ii) and (iv)], we get 𝑝 ∥𝑞. [If two lines are perpendicular to the same line, lines are parallel to each other] Hence, 𝑝 ∥𝑞.
Advertisements