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Board => O ničom => Topic started by: Johny Bravo on 29.09.2007, 03:37:58

Title: geometricka uloha.. plz help :)
Post by: Johny Bravo on 29.09.2007, 03:37:58
hi!

priatelka potrebuje vyriesit tuto ulohu, plz pomozte ked viete :)

znenie: z ABC mame oddelit plochu Q hranicou MN, ktora ma vychadzat z daneho bodu M na strane AB
dane: Q = 1/3*P; b ; v; v'
urcit: x

(Q obsah trojuholnika AMN, P obsah trojuholnika ABC)

a treba nakreslit trojuholnik (co nevieme) :)

dikes

PS: P>800m^2
Title: Re: geometricka uloha.. plz help :)
Post by: mrkvy on 29.09.2007, 03:40:46
mas to narysovat (a mas konkretne hodnoty) abo to len tak vseobecne?? ???
Title: Re: geometricka uloha.. plz help :)
Post by: Johny Bravo on 29.09.2007, 03:41:37
narysovat v mierke (nevieme mierku) :)
Title: Re: geometricka uloha.. plz help :)
Post by: mrkvy on 29.09.2007, 03:45:04
to M je na strane AB uz dane na pevno, ci to len tak je tam supnute?? Mas v zadani, kde presne ma byt??
Title: Re: geometricka uloha.. plz help :)
Post by: Johny Bravo on 29.09.2007, 03:45:14
zatial mame tolko:

P = 960 m^2
Q = 1/3 * 960 = 320 m^2

-------------------------------

b = 80 m
v' = 10 m

-------------------------------

P = (b*v)/2
960 = (80*v)/2
v = 24 m

-------------------------------

Q = (x*v')/2
320*2 = x*v'
640 = x*v'
x = 640/10 = 64 m

-------------------------------
Title: Re: geometricka uloha.. plz help :)
Post by: Johny Bravo on 29.09.2007, 03:45:43
Quote from: mrkvy on  29.09.2007, 03:45:04
to M je na strane AB uz dane na pevno, ci to len tak je tam supnute?? Mas v zadani, kde presne ma byt??
ne, to je len supnute :)
Title: Re: geometricka uloha.. plz help :)
Post by: mrkvy on 29.09.2007, 03:50:03
Mno lebo potom sa mi to zda easy.. :) Supnes to Q do 1/3 strany AB, potiahnes rovnobezku so stranou BC a mas MN, ktore by malo mat tiez 1/3, tak ako aj tie vysky a tym padom aj obsah... :) Ci nedobre?? ???
Title: Re: geometricka uloha.. plz help :)
Post by: Johny Bravo on 29.09.2007, 03:57:23
aha zabudol som napisat, ze
(Q obsah trojuholnika AMN, P obsah trojuholnika ABC)

sorry :)
Title: Re: geometricka uloha.. plz help :)
Post by: mrkvy on 29.09.2007, 03:59:14
pockaj, ale aj tak mi to stale vychadza dobre.. :)
Title: Re: geometricka uloha.. plz help :)
Post by: Pusta on 29.09.2007, 04:07:54
urcite je to konstrukcna uloha a nic si nezabudol napisat?
Title: Re: geometricka uloha.. plz help :)
Post by: Johny Bravo on 29.09.2007, 04:08:17
hm mi z vypocitanych udajov vieme nakreslit len tolko...

MN nie je rovnobezne s BC => MN nie je 1/3 BC, ani v' nie je 1/3 v
Title: Re: geometricka uloha.. plz help :)
Post by: Johny Bravo on 29.09.2007, 04:08:35
Quote from: Pusta on  29.09.2007, 04:07:54
urcite je to konstrukcna uloha a nic si nezabudol napisat?
vsetko je tam..
Title: Re: geometricka uloha.. plz help :)
Post by: Pusta on 29.09.2007, 04:24:04
a da sa thak ze si dopocitas ete jeden rozmer alebo nemozes?

lebo ak ano..thak potom si mozes dopocitat stranu kde mas bod M :
viac info na: http://www.gphmi.sk/pages/trojuholniky/euklid.html (http://www.gphmi.sk/pages/trojuholniky/euklid.html)
(https://www.tu-ke.com/forum/proxy.php?request=http%3A%2F%2Fanna21.szm.com%2F%2Ftroj.JPG&hash=de86ba515ed2c0e9f82c90ab13b5b93faafa31e9)
Title: Re: geometricka uloha.. plz help :)
Post by: Johny Bravo on 29.09.2007, 04:34:50
Quote from: Pusta on  29.09.2007, 04:24:04
a da sa thak ze si dopocitas ete jeden rozmer alebo nemozes?

lebo ak ano..thak potom si mozes dopocitat stranu kde mas bod M :
viac info na: http://www.gphmi.sk/pages/trojuholniky/euklid.html (http://www.gphmi.sk/pages/trojuholniky/euklid.html)
(https://www.tu-ke.com/forum/proxy.php?request=http%3A%2F%2Fanna21.szm.com%2F%2Ftroj.JPG&hash=de86ba515ed2c0e9f82c90ab13b5b93faafa31e9)
ale euklidova veta je na pravouhly trojuholnik a toto je vseobecny..
Title: Re: geometricka uloha.. plz help :)
Post by: mrkvy on 29.09.2007, 04:37:46
Pusticka mas to inak oznacene ako on.. (nesedia Ti boby ABC....)
Title: Re: geometricka uloha.. plz help :)
Post by: Pusta on 29.09.2007, 04:46:24
ja viem ze to mam inak ...a mas pravdu ze pravohuly  ak: ... thak s touto ulohou sa neda uz nic robit  bu
Title: Re: geometricka uloha.. plz help :)
Post by: Johny Bravo on 29.09.2007, 04:47:38
Quote from: Pusta on  29.09.2007, 04:46:24
ja viem ze to mam inak ...a mas pravdu ze pravohuly  ak: ... thak s touto ulohou sa neda uz nic robit  bu
tha asi tak heh
Title: Re: geometricka uloha.. plz help :)
Post by: mrkvy on 29.09.2007, 04:48:56
Kde je Raleon? On nema taketo elementarne problemy, ako my.. :)
Title: Re: geometricka uloha.. plz help :)
Post by: DeeL on 29.09.2007, 09:21:22
ale ved JB ... tie cisla co si napisal, ze ste akoze vypocitali, to si len nejakym odhadom bral? lebo keby ze tak, tak to v pohode sedi a z tych udajov by sa to malo dat aj narysovat, len by to mohlo byt dost vela moznosti toho trojuholnika, ale ked dodrzis dlzku zakladne a vysky tak by to malo sadnut, nie?
Title: Re: geometricka uloha.. plz help :)
Post by: stricky on 29.09.2007, 14:18:17
do kedy to je aktualne???
Title: Re: geometricka uloha.. plz help :)
Post by: Johny Bravo on 29.09.2007, 15:59:09
Quote from: DeeL on  29.09.2007, 09:21:22
ale ved JB ... tie cisla co si napisal, ze ste akoze vypocitali, to si len nejakym odhadom bral? lebo keby ze tak, tak to v pohode sedi a z tych udajov by sa to malo dat aj narysovat, len by to mohlo byt dost vela moznosti toho trojuholnika, ale ked dodrzis dlzku zakladne a vysky tak by to malo sadnut, nie?
tie cisla ktore su dane sme vymysleli sam.. trebalo vypocitat x...

ale vsak nevieme ako nakreslit, ved pozname len dolnu stranu> x,b a vysky -> v, v'..

Title: Re: geometricka uloha.. plz help :)
Post by: Johny Bravo on 29.09.2007, 15:59:24
Quote from: stricky on  29.09.2007, 14:18:17
do kedy to je aktualne???

kym to neriesime :)
Title: Re: geometricka uloha.. plz help :)
Post by: psicho on 29.09.2007, 22:09:48
na strednej sme sa ucili dajake vety sus uss a take , podla mna tie v sebe maju riesenie tejto ulohy , abo ne ?
Title: Re: geometricka uloha.. plz help :)
Post by: Pusta on 30.09.2007, 00:41:39
ano skratka sus znamena strana strana a uhol ktore zvieraju, usu - strana uhol uhol sss-3strany ...kedze mame iba 2 strany a ziadne uhol thak to asi nebude ono  :emot-shakehead:
Title: Re: geometricka uloha.. plz help :)
Post by: stricky on 30.09.2007, 01:49:47
strana-nic-strana... sak uz sa len nieco musi na to vymysliet....
Title: Re: geometricka uloha.. plz help :)
Post by: Ing. nemtom on 30.09.2007, 02:04:14
ja by som to vedel ale nechce sa mi to nakreslit, vzdy som bol spica v geometrii :emot-prettywink:
Title: Re: geometricka uloha.. plz help :)
Post by: Pusta on 30.09.2007, 02:08:17
thak tym si teda neuveritelne pomohol Johnymu  :emot-shakehead:
Title: Re: geometricka uloha.. plz help :)
Post by: Ing. nemtom on 30.09.2007, 02:24:03
dobre no:), nakreslim si to, mozno fakt to budem vediet:)

edit: no som na to kukol zislo by sa dozvediet co je to x co treba urcit...
Title: Re: geometricka uloha.. plz help :)
Post by: Johny Bravo on 30.09.2007, 14:59:00
x je dlzka |AN|
(pomocou priamky MN je pozemok rozsekany na dva kusky)