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Prove that if one angle of a triangle is...

Prove that if one angle of a triangle is equal to the sum of the other two angles, the triangle is right angled.

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MBD-Lines and Angles-Exercise
  1. In Fig., the side QR of DeltaPQR is producted to a point S. If the bis...

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  2. If the angles of triangle are in the ratio of 2 : 3 : 4, find the thre...

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  3. Prove that if one angle of a triangle is equal to the sum of the other...

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  4. In the given Fig , if QT | PR, angleTQR = 40^@ and angleSPR = 30^@, f...

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  5. In the given figure prove that g = alpha + beta + gamma.

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  6. In given fig. find x.

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  7. Prove that sum of all the interior angles of a pentagon is 540^@.

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

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  9. In the given Fig , Sides AB and AC of a DeltaABC are produced to E an...

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  10. An exterior angle of a triangle is less than either of its interior op...

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  11. Sum of the three angles of a triangle is 180^@.

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  12. Sum of the four angles of a quadrilateral is the four right angles.

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  13. A triangle can have two right angles.

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  14. A triangle can have two acute angles.

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  15. A triangle can have two obtuse angles

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  16. An exterior angle of a triangle is equal to the sum of the two interio...

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  17. Sum of the three angles of a triangle is .............. .

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  18. An exterior angle of a triangle is equal to the two ............. oppo...

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  19. An exterior angle of a triangle is always .................... than ei...

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  20. A triangle cannot have more than ............ right angles

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