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Draw a triangle ABC and mark the midpoin...

Draw a triangle ABC and mark the midpoints E and F of two sides of triangle. `bar(AB) and bar(AC)` respectively. Join the point E and F as shown in the figure.
Measure EF and the third side BC of the triangle. Also measure `angleAEF and angleABC`.
We find `angleAEF = angleABC and bar(EF)=(1)/(2)bar(BC)`
As these are corresponding angles made by the transversal AB with lines EF and BC, we say `EF"||"BC.`

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NCERT TELUGU-QUADRILATERALS-EXERCISE
  1. ABCD is a parallelogram. AC and BD are the diagonals intersect at O. P...

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  2. ABCD is a square. E, F, G and H are the mid points of AB, BC, CD and D...

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  3. Draw a triangle ABC and mark the midpoints E and F of two sides of tri...

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  4. ABC is a triangle . D is a point of AB such that AD=(1)/(4)AB and E is...

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  5. ABCD is quadrilateral E, F, G and H are the midpoints of AB, BC, CD an...

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  6. Show that the figure formed by joining the midpoints of sides of a rho...

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  7. In a parallelogram ABCD, E and F are the midpoints of the sides AB and...

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  8. Show that the line segments joining the midpoints of the opposite side...

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  9. ABC is a triangle right angled at 'C'. A line through the midpoint M o...

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  10. ABC is a triangle right angled at C. A line through the midpoint M of ...

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  11. ABC is a triangle right angled at 'C'. A line through the midpoint M o...

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  12. ABCD is a parallelogram and P is a point of bar(CD). Show that ar(/\AB...

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  13. PQRS is a parallelogram. K. L are the midpoints on PQ, RS respectively...

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  14. ABCD is a parallelogram and P, Q are the mid points of bar(AD) and bar...

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  15. ABCD is a parallelogram and P, Q are the mid points of bar(AD) and bar...

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  16. In /\ABC, AD is the median on bar(BC). 'E' is the midpoint of AD. Draw...

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  17. In a Parallelogram PQRS, /SPQ=70^@ and angle SQR=65^@. Find the other ...

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  18. In a parallelogram ABCD, angleABC=50^@.Find the other angles.

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  19. The four angles of a quadrilateral is in the ratio of 3:4:5: 6. Find t...

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  20. The four angles of a quadrilateral is in the ratio of 2 : 3:5: 8. Find...

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