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In an equilateral triangle ABC, D is a p...

In an equilateral triangle ABC, D is a point on side BC such that `B D=1/3B C`. Prove that `9A D^2=7A B^2`.

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The correct Answer is:
`=7AB^(2)`
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MTG IIT JEE FOUNDATION-TRIANGLES -NCERT Section Exercise 6.5
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  2. Sides of triangles are given below. Determine which of them right t...

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  3. Sides of triangle are given below .Determine which of them are rig...

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  4. PQR is a triangle right angled at P and M is a point on QR such that ...

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  5. In Figure 2, Delta ABD is a right triangle, right-angled at A and AC |...

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  6. In the figure , ABD is a triangle right angled at A and AC bot Bd . Sh...

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  7. ABC is an isosceles triangle right angled at C. Prove that A B^2=2A C...

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  8. ABC is an isosceles triangle with AC = BC. If A B^2=2A C^2, prove tha...

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  9. ABC is an equilateral triangle of side 2a. Find each of its altitudes...

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  10. Prove that the sum of the squares of the sides of a rhombus is equa...

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  11. In figure, O is a point in the interior of a triangle ABC, O D|B C ,O...

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  16. D and E are points on the sides CA and CB respectively of a triangle ...

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  17. The perpendicular from A on side BC of a ABC intersects BC at D such t...

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  18. In an equilateral triangle ABC, D is a point on side BC such that B D=...

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  19. In an equilateral triangle, prove that three times the square of on...

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  20. Tick the correct answer and justify: In DeltaA B CdotAB = 6sqrt(3)cm...

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