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In a triangle, if orthocentre, circumcen...

In a triangle, if orthocentre, circumcentre, incentre and centroid coincide, then the triangle must be_____

A

obtuse angled

B

isosceles

C

equilteral

D

right-angled

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UNITED BOOK HOUSE-Theorems related to circle -Exercise
  1. The length of two chords AB and CD of a circle of centre O are equal a...

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  2. AB and CD are two equal chords of a circle with centre O. If angleAOB ...

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  3. PQ and RS are two chords of equal length of a circle with centre O. If...

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  4. AB and CD are two chords of equal lengths of the circle with centre at...

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  5. P is a point within a circle with centre O. If the radius of the circl...

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  6. Two parallel chords PQ and ST of length 10cm. And 24cm. Respectively a...

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  7. O is the circumcentre of trianglePCQ and CA is a diameter of the circl...

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  8. The length of each of two parallel chords AB and CD is 16cm. If the ra...

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  9. If O is the circumcentre of triangleABC, then the value of (angleOBC +...

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  10. ABC is a right angled triangle, right angled at B such that BC = 6 cm ...

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  11. From three non-collinear points we can draw

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  12. The length of each of two parallel chords AB and CD is 16cm. If the ra...

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  13. The radius of the incircle of the equilateral triangle having each sid...

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  14. In a triangle, if orthocentre, circumcentre, incentre and centroid coi...

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  15. One chord of a circle is known to be 10 cm. The radius of this circle ...

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  16. Two equal circles of radius 4 cm interest each other such that each pa...

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  17. Chords AB and CD of a circle intersect externally at P. If AB = 6 cm, ...

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  18. Chords AC and BD of a circle with centre O interest at right angles at...

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  19. If two concentric circles are of radii 5 cm and 3 cm, then the length ...

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  20. Two circles having radii r units interest each other in such a way tha...

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