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02 August, 2007

Basic Proportionality Theorem

Aim To verify the Basic Proportionality theorem by paper cutting and pasting using a parallel line board.
Material required Coloured paper, parallel line board, pair of scissors, sketch pen, ruler, glue

Procedure
Step 1 Draw a triangle on a coloured paper.
Step 2 Label the triangle as ABC.
Step 3 Cut the triangle.
Step 4 Take the parallel line board and place the triangle ABC on it such that the side BC coincides with any of lines on the board.
Step 5 Draw a line parallel to BC using a ruler by the help of lines on the parallel line board.
Step 6. Let the parallel line drawn to BC intersect AB and AC at D and E respectively.
Step 7. Find AD/DB and AE/EC.
Step 8. What do you observe?
Step 9. Repeat the activity for two more triangles.
Step 10. Write the result.

If a line is drawn parallel to any side of a triangle,to intersect the other two sides at two distinct points,then the other two sides are divided in the same ratio.

16 comments:

Anonymous said...

thank you.....

diya guha said...

what will happen if we draw the line on the triangle through line 'n'?

Rashmi Kathuria said...

Dear Diya,
When we draw a line using line n, then also we will get a line parallel to the side BC.You may name it as PQ. Verify AP/PB = AQ/QC.
I hope it will help!

Anonymous said...

What are the applications of BPT or Thales theorm

Anonymous said...

thanx a lot helped me 4 ma assignments!!!!!!!! thanx a lot!!!!!!!!!

Sara said...

Helped a loooot! I had NO clue what to do! Thank you for clearing my doubts! I really appreciate it! :D This is a good thing which you are doing!

ritu said...

This is a noble deed for clueless people thanks

Anonymous said...

thanx man... helps in my assignment here....

littlemakz said...

great!

Anonymous said...

Thanks it's really helped me

Anonymous said...

Nice

Anonymous said...

thanks

Sahil gill 959 said...

thanks it helped me a lot

Anonymous said...

Awesome stuff

Anonymous said...

nice and thanks for help

Unknown said...

Great work saved a lot of time
Thanks

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