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Take four congruent card-board copies of...

Take four congruent card-board copies of any quadrilateral ABCD, with angles as shown in the figures. Arrange the copies as shown in the figure, where angles `angle1, angle2,angle3,angle4` meet at a point. What can you say about the sum of the angles `angle1, angle2,angle3 and angle4`.

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ASHOK PUBLICATION ASSAM-Understanding Quadrilaterals.-EXAMPLE
  1. Explain how a square is. a parallelogram

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  2. Explain how a square is. a rhombus

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  3. Explain how a square is. a rectangle

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  4. Name the quadrilaterals whose diagonals. bisect each other

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  5. Name the quadrilaterals whose diagonals. are perpendicular bisectors...

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  6. Name the quadrilaterals whose diagonals. are equal

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  7. Explain why a rectangle is a convex quadrilateral.

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  8. ABC is a right-angled triangle and O is the mid point of the side oppo...

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  9. Take any quadrilateral, say ABCD , Divide it into two triangles, by dr...

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  10. Take four congruent card-board copies of any quadrilateral ABCD, with ...

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  11. Take four congruent card-board copies of any quadrilateral ABCD, with ...

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  12. Consider a concave quadrilateral ABCD, Split it into two triangles and...

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  13. Take a regular hexagon. What is the sum of the measures of its exter...

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  14. Take a regular hexagon. Is x=y=z=p=q=r where x,y,z,p,q,r are exterio...

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  15. What is the measure of each exterior angle?

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  16. What is the measure of each interior angle?

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  17. Draw a rough figure, of a quadrilateral that is not a parallelogram bu...

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  18. A mason has made a concrete slab. He needs it to be rectangular. In wh...

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  19. A square was defined as a rectangle with all sides equal. Can we defin...

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  20. Can a trapezium have all angles equal? Can it have all sides equal? Ex...

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