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In the fig. arms BA and BC of angleABC r...

In the fig. arms BA and BC of `angleABC` respectively parallel to arms BD and EF of `angleABC`. Prove that `angleABC+angleDEF=180^@`

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MODERN PUBLICATION-LINES AND ANGLES-EXERCISE
  1. In the fig. p is a transversal to lines m and angle2=120^@ and angle5=...

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  2. If l,m and n are three straight lines such that l||m and l||n then pro...

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  3. In the fig. arms BA and BC of angleABC respectively parallel to arms B...

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  4. In triangleABC, if angleB=76^@, and angleC=48^@ find angleA

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  5. In triangleABC, if angleA=55^@, angleB=40^@ find angleC

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  6. In triangleABC, if angleA+angleB=108^@ and angleB+angleC=109^@, find a...

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  7. Two angles of a triangle are equal and the third angle is greater than...

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  8. The sum of two angles of a triangle is 116^@ and difference is 24^@. F...

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  9. In a right angled triangle one of the acute angle measures 53^@, find ...

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  10. If each angle of a triangle is less than the sum and other two, show t...

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  11. The exterior angles,bounded obtained on producing of a triangle of bot...

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  12. In the fig side BC of triangleABC is produced to angleACD=128^@ and an...

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  13. Calculate the value of x in each of the following figures

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  14. Calculate the value of x in each of the following figures

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  15. Calculate the value of x in each of the following figures

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  16. Calculate the value of x in each of the following figures

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  17. Calculate the value of x in each of the following figures

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  18. Calculate the value of x in each of the following figures

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  19. In the fig. ALbotBC and AM is the bisector of angleA. Find the measure...

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

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