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construction

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Anu..i luv icse...:)
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PostSubject: construction Fri Feb 13, 2009 8:42 am

Q. using ruler n compasses only, construct an isosceles triangle ABC having base=4cm, vertical angle=45 and median through vertex equal to 2.8 cm.

now, what is vertical angle?????

plz give steps. i am doubtful about my own answer.


Last edited by Anu..i luv icse...:) on Sat Feb 14, 2009 8:37 am; edited 1 time in total
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gm8496
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PostSubject: Re: construction Fri Feb 13, 2009 1:42 pm

do you mean vertical angle??? Question Question
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Midhun Sarath
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PostSubject: Re: construction Fri Feb 13, 2009 1:49 pm

she didn't read ques properly.. in ques.. it is vertical and she said vertex !
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PostSubject: Re: construction Fri Feb 13, 2009 1:52 pm

vertical angle dear.. in an isosceles triangle is the unequal angle.. the two equal ones r called base angles..
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Midhun Sarath
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PostSubject: Re: construction Fri Feb 13, 2009 1:57 pm

yep
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PostSubject: Re: construction Fri Feb 13, 2009 1:59 pm

oh...yeah i meant vertical angle Very Happy

now, give me steps of construction!! Laughing
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PostSubject: Re: construction Fri Feb 13, 2009 9:54 pm

arrey....no one is answering??????

anyone...common!!!

answer....

Welcome welcome!! Very Happy
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PostSubject: Re: construction Fri Feb 13, 2009 11:09 pm

guys, plzz...common....answer my question....
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PostSubject: Re: construction Sat Feb 14, 2009 12:18 am

hey i am still confused you have given the vertical angle n the description you hav given for it is the same as vertex angle and then you are asking what is vertex angle
quite confusing
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PostSubject: Re: construction Sat Feb 14, 2009 10:04 am

i find dis question quite weird coz i dont think dere is any need of giving median in it.ok steps of construction r:
1-vertical angle given so find out d 2 base angles.
180-45=145 =72.5
2 2
2-draw base =4cm.
3-now on both sides of line draw angles of 72.5
3-d point at wich de intersect is d third vertex of d triangle.
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PostSubject: Re: construction Sat Feb 14, 2009 8:00 pm

yeah...right siya....my ans was the same....even i was thinking y they gave median....so i thought of asking this here.....!!!!
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PostSubject: Re: construction Sat Feb 14, 2009 8:43 pm

ur most welcome dear!!!!
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PostSubject: Re: construction Sun Feb 22, 2009 6:41 pm

THE DATA IS NOT REDUNDANT, hw will you construct 72.5 using compass and ruler only.
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PostSubject: Re: construction Sun Feb 22, 2009 9:22 pm

thts a good question....i dont know...then tell me another solution to the question..or the question itself should be wrong Suspect No Suspect
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PostSubject: Re: construction Mon Feb 23, 2009 6:39 pm

take base as given, 4cm. draw perpendicular bisector of base( in iso triangle median and altitude are same).mark 2.8 cm on this median, you get ur vetex. at this point construct 22.5 degrees on both sides i.e. median should be bisecting 45.
for condtructing 22.5--- construct 45 on both sides and bisect.

hope i m clear
all th best
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PostSubject: Re: construction Mon Feb 23, 2009 7:41 pm

yes...thnks

i didnt know tht alt. n median r d same
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PostSubject: Re: construction Mon Feb 23, 2009 8:04 pm

ONLY FO ISOSCELES AND equilateral triangles
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