If AB = AC of a isosceles triangle then ABCD is a Parallelogram
#isoscelestriangle#parallelogram #parallelogramproperties #cbse
In this video, we prove an important geometry application:
👉 If ABC is an isosceles triangle (AB = AC)
👉 AD bisects exterior angle ∠PAC
👉 CD ∥ AB
Then we show that:
✔ ∠DAC = ∠BCA
✔ ABCD is a parallelogram
💡 Concepts used:
Isosceles triangle properties
Exterior angle theorem
Angle bisector
Alternate angles
Parallel lines
🎯 This is very important for:
Class 9 | Class 10 | Boards | Competitive Exams
📌 Watch till the end for full clear proof!
#geometry #geometryzone #maths #class9 #theorem #application #proof
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keywords:-
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time stamp:-
00:00-00:07 intro
00:07-00:27 1st part of theorem i.e statement
00:27-01:00 2nd part of theorem i.e given
01:00-01:06 construction
01:06-01:02 proof
02:02-02:24 outro of class
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Disclaimer:
This video is created for educational purposes only. All geometric constructions shown here follow standard school-level methods. Students are advised to practice carefully using proper tools. Geometry Zone is not responsible for any misuse of the content.
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some important video link on parallelogram:-
parallelogram & its properties:
• Parallelogram Explained in 3 Minutes | Pro...
Introduction of quadrilateral:
• From Triangle to Quadrilateral | Introduct...
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