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Prove that the angle between internal bi...

Prove that the angle between internal bisector of one base angle and the external bisector of the other is equal to one-half of the vertical angles.

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MODERN PUBLICATION-LINES AND ANGLES-EXERCISE
  1. In triangle ABC, BDbotAC and CEbotAB. If BD and CE intersect at O, pro...

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

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

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

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

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

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  7. Define complementary angles.

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  8. Define supplementary angles.

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  9. Define adjacent angles.

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

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

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

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

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  14. What is the supplement of a right angle?

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

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

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

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

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  19. IF the angles of a triangle are in the ratio 1:2:3 find the measure of...

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  20. If the angles A,B and C of a triangle ABC satisty the relation 2B=A+C,...

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