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The total measure of the three angles of...

The total measure of the three angles of a triangle is 180°.
To justify this let us use the exterior angle property of a triangle.

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PSEB-THE TRIANGLE AND ITS PROPERTIES-EXAMPLE
  1. Find the value of the unknown interior angle x in the following figure...

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  2. Find the value of the unknown interior angle x in the following figure...

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  3. The total measure of the three angles of a triangle is 180°. To justif...

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  4. In the given figure find mangleP.

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  5. Find the value of the unknown x in the following diagrams:

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  6. Find the value of the unknown x in the following diagrams:

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  7. Find the value of the unknown x in the following diagrams:

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  8. Find the values of the unknowns x and y in the following diagrams:

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  9. Find the values of the unknowns x and y in the following diagrams:

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  10. Find the values of the unknowns x and y in the following diagrams:

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  11. Find the values of the unknowns x and y in the following diagrams:

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  12. Find the values of the unknowns x and y in the following diagrams:

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  13. Find the values of the unknowns x and y in the following diagrams:

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  14. Two angles of a triangle are 30^@ and 80^@. Find the third angle.

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  15. One of the angles of a trianlge is 80^@ and the other two angles are ...

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  16. The three angles of a triangle are in the ratio 1:2:1. Find all the an...

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  17. Can you have a triangle with two right angles?

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  18. Can you have a triangle with two obtuse angles?

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  19. Can you have a triangle with two acute angles?

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  20. Can you have a triangle with all the three angles greater than 60^@?

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