Proof of vertically opposite angles
CBSE, JEE, NEET, CUET
Question Bank, Mock Tests, Exam Papers
NCERT Solutions, Sample Papers, Notes, Videos
Posted by Asha Rani 3 years, 10 months ago
- 1 answers
Related Questions
Posted by Akhilesh Patidar 2 months, 3 weeks ago
- 0 answers
Posted by Savitha Savitha 2 months, 3 weeks ago
- 0 answers
Posted by Gnani Yogi 2 months, 2 weeks ago
- 0 answers
Posted by Sheikh Alfaz 3 days, 17 hours ago
- 0 answers
Posted by Alvin Thomas 2 months, 2 weeks ago
- 0 answers
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
Gaurav Seth 3 years, 10 months ago
From the figure, we know that,
AB and CD intersect each other at point O.
Let the two pairs of vertically opposite angles be,
1st pair – ∠AOC and ∠BOD
2nd pair – ∠AOD and ∠BOC
To prove:
Vertically opposite angles are equal,
i.e., ∠AOC = ∠BOD, and ∠AOD = ∠BOC
From the figure,
The ray AO stands on the line CD.
We know that,
If a ray lies on a line then the sum of the adjacent angles is equal to 180°.
⇒ ∠AOC + ∠AOD = 180° (By linear pair axiom) … (i)
Similarly, the ray DO lies on the line AOB.
⇒ ∠AOD + ∠BOD = 180° (By linear pair axiom) … (ii)
From equations (i) and (ii),
We have,
∠AOC + ∠AOD = ∠AOD + ∠BOD
⇒ ∠AOC = ∠BOD – – – – (iii)
Similarly, the ray BO lies on the line COD.
⇒ ∠DOB + ∠COB = 180° (By linear pair axiom) – – – – (iv)
Also, the ray CO lies on the line AOB.
⇒ ∠COB + ∠AOC = 180° (By linear pair axiom) – – – – (v)
From equations (iv) and (v),
We have,
∠DOB + ∠COB = ∠COB + ∠AOC
⇒ ∠DOB = ∠AOC – – – – (vi)
Thus, from equation (iii) and equation (vi),
We have,
∠AOC = ∠BOD, and ∠DOB = ∠AOC
Therefore, we get, vertically opposite angles are equal.
Hence Proved.
0Thank You