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 | geometry qstn!!!..help needed?? |
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hello kamal sir, plz help me wid dis qstn- D is the mid point of side QR of trngle PQR .O is a point on PD such that PO is 4 times of OD.QO and RO produced meet PR and PQ in E and F. find PQ if FQ =3 cm??? |
 | Re: geometry qstn!!!..help needed?? |
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Hi Arsh I am just giving a small hint. Draw a line parallel to RF through D which meets PQ in S (say). Now, can you see any pairs of similar triangles? Try to equate the ratio of corresponding sides of similar triangles. I hope you can solve it easily now. Kamal Lohia |
| Re: geometry qstn!!!..help needed?? |
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Draw DG || RF which meets PQ at G Now FG=QG as D is the midpoint theorem using midpoint theorem: read here http://www.quantexpert.co.in/quantnotes/geometry/geometry4.php#intercept-theorem Now,FG=3/2 Again using similarity of triangles, PF/FG=4/1=> PF/(3/2)=4=> PF=6 Hence PQ=6+3=9 |
| Re: geometry qstn!!!..help needed?? |
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Hi arsh, I'm getting 9 as ans acc to the approach given by kamal sir. Please confirm the ans. |
| Re: geometry qstn!!!..help needed?? |
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Please suggest how to do this: ABC is a isosceles triangle where AB = AC = 13 cm. I is the incentre of ABC such that AI = 7cm. Also BC = 20cm. Find ∠ACB? (a) 40' (b) 45' (c) 50' (d) Data insufficient  |
