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AD, BE and CF are altitudes of triangle ...

AD, BE and CF are altitudes of `triangle` ABC. If AD = BE = CF, prove that `triangle` ABC is an equilateral triangle.

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KUMAR PRAKASHAN-TRIANGLES-SKILL TESTING EXERCISE
  1. In the given figure, XM and YN are both lt perpendicular to line segme...

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  2. In the given figure AB and CD bisect each other at O. Prove that AC = ...

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  3. In rectangle ABCD, E is the midpoint of side BC. Prove that, AE = DE.

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  4. Prove that the medians of an equilateral triangle are equal.

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  5. In the given figure, AB and DC are both perpendicular to line segment ...

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  6. In triangle ABC, AB = AC and the bisector of angle A lt intersects BC ...

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  7. In triangle ABC, the bisectors of angleB and angle C intersect at I. ...

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  8. In triangle ABC, AB = AC and angle A = 36^(@). The bisector of angle C...

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  9. In the given figure, PS = PR and angle TPS = angle QPR. Prove that P...

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  10. In triangle ABC, D is the midpoint of BC. DFZAB and DE bot AC, where p...

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  11. In parallelogram ABCD, diagonals AC and BD are equal. Find the measure...

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  12. triangle ABC and triangle DBC are isosceles triangles on the same base...

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  13. AD, BE and CF are altitudes of triangle ABC. If AD = BE = CF, prove t...

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  14. In quadrilateral ABCD, BA = BC and DA = DC. Prove that BD bisects ang...

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  15. In triangle ABC, AB gt AC and D is any point of BC. Prove that, AB gt...

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  16. In triangle ABC, AC gt AB. AB is extended to P and AC is extended to Q...

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  17. In triangle ABC, AD, BE and CF are altitudes. Prove I, that, AD + BE +...

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  18. Point S lies in the interior of A PQR. Prove that, SQ + SR lt PQ + PR.

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  19. In triangle ABC, AD is a median. Prove that AB + AC gt 2AD

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  20. For any triangle, prove that the sum of the sides of the triangle is g...

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