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How many non-overlapping triangles can w...

How many non-overlapping triangles can we make in a n-gon (polygon having n sides), by joining the vertices?

A

n –1

B

n –2

C

n –3

D

n –4

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NCERT EXEMPLAR-UNDERSTANDING QUADRILATERALS AND PRACTICAL GEOMETRY-EXERCISE
  1. Which of the following properties describe a trapezium?

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  2. What is the maximum number of obtuse angles that a quadrilateral can h...

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  3. How many non-overlapping triangles can we make in a n-gon (polygon hav...

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  4. What is the sum of all angles of a hexagon?

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  5. If two adjacent angles of a parallelogram are (5x – 5)° and (10x + 35)...

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  6. A quadrilateral whose all sides are equal, opposite angles are equal a...

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  7. A quadrilateral whose opposite sides and all the angles are equal is a

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  8. A quadrilateral whose all sides, diagonals and angles are equal is a

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  9. How many diagonals does a hexagon have?

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  10. If the adjacent sides of a parallelogram are equal then parallelogram ...

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  11. If the diagonals of a quadrilateral are equal and bisect each other, t...

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  12. find the sum of all exterior angles of a triangle.

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  13. Which of the following is an equiangular and equilateral polygon?

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  14. Which one has all the properties of a kite and a parallelogram?

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  15. The angles of a quadrilateral are in the ratio 1 : 2 : 3 : 4. The smal...

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  16. In the trapezium ABCD, the measure ofangleD is

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  17. A quadrilateral has three acute angles. If each measures 80°, then the...

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  18. The number of sides of a regular polygon where each exterior angle has...

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  19. In a parallelogram PQRS, if angleP = 60°, then other three angles are

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  20. If two adjacent angles of a parallelogram are in the ratio 2 : 3, then...

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