In an equilateral triangle ABC, D is a point on side BC such that BD = 1/3 BC. Prove that 9 AD2 = 7

Class-10, Maths Triangles
Exercise 6.5, Question No. 15
In an equilateral triangle ABC, D is a point on side BC such that BD = 1/3 BC.
Prove that 9 AD2 = 7 AB2 .
Most Important Question from Triangles for Board Exam
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How to know about construction part! There should be some hint about what to construct

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Sir can we write in construction such that be=ec instead of proving it congruent

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Then draw a perpendicular and use a theorem "perpendicular drawn in an equilateral Triangle is median" Thank you so much for watching our video🙏🙏🙏😊 I hope you would love watching these videos as well😊 Extra Questions (Most Important Questions) 👉bit.ly/2JtCBnL Chapter 1: Real Numbers 👉bit.ly/3dIG9k2 Chapter 2: Polynomials 👉bit.ly/33ZTM9X Chapter 3: Pair of linear Equations in Two Variables 👉bit.ly/2UxsZ1R Chapter 4: Quadratic Equations 👉bit.ly/3bxIgoW Chapter 5: Arithmetic Progression 👉bit.ly/2wR6oEi Chapter 6: Triangles 👉bit.ly/2QXb828 Chapter 7: Coordinate Geometry 👉bit.ly/2UTybfl Chapter 8: Introduction to Trigonometry 👉bit.ly/3ayeZKz Chapter 9: Some Applications of Trigonometry 👉bit.ly/2V3RrXJ Chapter 10: Circles 👉bit.ly/2xyBLn3 Chapter 11: Constructions 👉bit.ly/39wPDLV Chapter 12: Area Related to Circles 👉bit.ly/3aywDOs Chapter 13: Surface Areas and Volumes 👉bit.ly/3dLOtiK Chapter 14: Statistics 👉bit.ly/2w2OZrT

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