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In triangle ABC, BDbotAC and CEbotAB. If...

In triangle ABC, `BDbotAC` and `CEbotAB`. If BD and CE intersect at O, prove that `angleBOC=180^@-A`.

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MODERN PUBLICATION-LINES AND ANGLES-EXERCISE
  1. In the fig. ALbotBC and AM is the bisector of angleA. Find the measure...

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  2. In triangleABC, AD bisects angleA and angleC>angleB prove that angleAD...

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  3. In triangle ABC, BDbotAC and CEbotAB. If BD and CE intersect at O, pro...

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  4. If two parallel lines are intersected by a a transversal, then interio...

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  5. Prove that the angle between internal bisector of one base angle and t...

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  6. A triangle ABC is right angled at A. AM is drawn perpendicular to BC. ...

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  7. In triangle ABC angleB=45^@, angleC=55^@ and bisector of anglesA ameet...

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  8. Two plane mirrors l and m are placed perpendicular to each other as sh...

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  9. Define complementary angles.

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  10. Define supplementary angles.

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  11. Define adjacent angles.

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  12. Prove that complement of an angle is an acute angles.

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  13. Prove that supplementary of an angle is an obtuse angles.

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  14. What is the complement of angle of x^@?

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  15. What is the supplement of angle y^@?

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  16. What is the supplement of a right angle?

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  17. Find the angle which is equal to its supplement.

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  18. Find the measure of an angle which is equal to five times the compleme...

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  19. What is the sum of the angles of a rectangle ?

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  20. What is the sum of the angles of a rectangle ?

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