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wu :: forums    riddles    easy (Moderators: william wu, Icarus, ThudnBlunder, Grimbal, Eigenray, towr, SMQ)    Triangles « Previous topic | Next topic » Pages: 1 2  Reply Notify of replies Send Topic Print    Author  Topic: Triangles  (Read 12530 times) alien2 Uberpuzzler     Gender: Posts: 6989 Triangles   « on: Oct 22nd, 2012, 1:33pm » Quote Modify By drawing two squares and two lines, how many triangles can you make? IP Logged benmartorano Newbie     Posts: 48 Re: Triangles   « Reply #1 on: Oct 22nd, 2012, 4:13pm » Quote Modify 6 IP Logged peoplepower Junior Member     Posts: 63 Re: Triangles   « Reply #2 on: Oct 22nd, 2012, 4:52pm » Quote Modify I get 12 by ineterleaving the squares and drawing the lines such that each one cuts two already constructed triangles in half. IP Logged gotit Uberpuzzler     Gender: Posts: 804 Re: Triangles   triangles.jpg « Reply #3 on: Oct 23rd, 2012, 6:31am » Quote Modify I get 15 « Last Edit: Oct 23rd, 2012, 6:34am by gotit » IP Logged All signatures are false. towr wu::riddles Moderator Uberpuzzler Some people are average, some are just mean.     Gender: Posts: 13730 Re: Triangles   « Reply #4 on: Oct 23rd, 2012, 8:42am » Quote Modify I can get at least 1 more than gotit. IP Logged Wikipedia, Google, Mathworld, Integer sequence DB Noke Lieu Uberpuzzler pen... paper... let's go! (and bit of plastic)     Gender: Posts: 1884 Re: Triangles   « Reply #5 on: Oct 24th, 2012, 4:53am » Quote Modify ...and I assume towr also has 5 *obvious* pentagons in the middle? I just counted, but hesitant to post my score. IP Logged a shade of wit and the art of farce. towr wu::riddles Moderator Uberpuzzler Some people are average, some are just mean.     Gender: Posts: 13730 Re: Triangles   « Reply #6 on: Oct 24th, 2012, 8:50am » Quote Modify I only see 4 obvious pentagons.. So maybe it's a different formation; 5's a bit odd anyway. IP Logged Wikipedia, Google, Mathworld, Integer sequence DB Grimbal wu::riddles Moderator Uberpuzzler     Gender: Posts: 7527 Re: Triangles   « Reply #7 on: Oct 24th, 2012, 9:57am » Quote Modify 18  The tricky part is actually to count the triangles. IP Logged towr wu::riddles Moderator Uberpuzzler Some people are average, some are just mean.     Gender: Posts: 13730 Re: Triangles   « Reply #8 on: Oct 24th, 2012, 10:15am » Quote Modify You're right, I actually had 20 IP Logged Wikipedia, Google, Mathworld, Integer sequence DB Noke Lieu Uberpuzzler pen... paper... let's go! (and bit of plastic)     Gender: Posts: 1884 Re: Triangles   « Reply #9 on: Oct 24th, 2012, 2:45pm » Quote Modify Um... Yes. Counting IS hard. I had 4 pentagons  and 24 triangles. I didn't find counting the triangles hard... 4*3 (the bisected corners), 4 (the unbisected corners), 4 (the quarter squares), 4 (the half squares) . « Last Edit: Oct 24th, 2012, 2:59pm by Noke Lieu » IP Logged a shade of wit and the art of farce. Grimbal wu::riddles Moderator Uberpuzzler     Gender: Posts: 7527 Re: Triangles   « Reply #10 on: Oct 25th, 2012, 12:48am » Quote Modify OK, I recounted, I get 24 too. IP Logged towr wu::riddles Moderator Uberpuzzler Some people are average, some are just mean.     Gender: Posts: 13730 Re: Triangles   « Reply #11 on: Oct 25th, 2012, 8:48am » Quote Modify Yeah, me too. I can't believe how hard counting triangles is... IP Logged Wikipedia, Google, Mathworld, Integer sequence DB benmartorano Newbie     Posts: 48 Re: Triangles   « Reply #12 on: Oct 25th, 2012, 3:45pm » Quote Modify I should not have tried doing this in my head.... IP Logged Noke Lieu Uberpuzzler pen... paper... let's go! (and bit of plastic)     Gender: Posts: 1884 Re: Triangles   « Reply #13 on: Oct 25th, 2012, 5:19pm » Quote Modify I too was comfortable with 20 (hence  'post my score'). It was only after I posted that I noticed the 4 largest triangles... IP Logged a shade of wit and the art of farce. Grimbal wu::riddles Moderator Uberpuzzler     Gender: Posts: 7527 Re: Triangles   « Reply #14 on: Oct 26th, 2012, 7:45am » Quote Modify Who put this in easy anyway?     I have a trick to count triangles: I take any outer corner of the figure, count how many triange there are touching that corner. Then I erase it (i.e. put a finger on it) and restart with another corner until no more triangle is possible.   That makes it easy.   But I still miscounted. IP Logged pfeinstein Junior Member     Gender: Posts: 60 Re: Triangles   « Reply #15 on: Nov 7th, 2012, 6:55am » Quote Modify I get hidden: 14 , and who put this in easy anyway? IP Logged A Wikipedia fan, I contribute regularly there on mechanical engineering & handle corrosion resistant valves at alloy-valves.com. Ricky30 Newbie     Gender: Posts: 1 Re: Triangles   « Reply #16 on: Dec 2nd, 2012, 4:02am » Quote Modify There may have many triangles. It depends on how you arrange the square and draw the line. IP Logged marlonmark Newbie     Gender: Posts: 43 Re: Triangles   « Reply #17 on: Jan 2nd, 2013, 2:28am » Quote Modify hats off got it nice one.. IP Logged Technologeek Junior Member Any problem? Contact me by MP     Gender: Posts: 52 Re: Triangles   « Reply #18 on: Feb 2nd, 2013, 2:02am » Quote Modify I can't find the way to get more than 11 triangles . IP Logged Against Wikipedia totalitarism - Proofs Wiki: The Mean value theorem proof and Fundamental theorem of calculus towr wu::riddles Moderator Uberpuzzler Some people are average, some are just mean.     Gender: Posts: 13730 Re: Triangles   triangles.png « Reply #19 on: Feb 2nd, 2013, 1:25pm » Quote Modify See attachment, 8 red,   8 green, (4 of which consist of two reds) 4 blue,   4 orange (consisting of two blues, which are shared) IP Logged Wikipedia, Google, Mathworld, Integer sequence DB Apala Newbie     Posts: 7 Re: Triangles   « Reply #20 on: Mar 13th, 2013, 12:54am » Quote Modify 22 but it depends on your placement. IP Logged Mariko79 Newbie Better than Van Damme     Posts: 30 Re: Triangles   « Reply #21 on: Apr 1st, 2013, 4:01am » Quote Modify Very sticky question...I think it's 20   IP Logged SEMfuze Newbie     Posts: 11 Re: Triangles   « Reply #22 on: Sep 27th, 2013, 7:39am » Quote Modify on Feb 2nd, 2013, 1:25pm, towr wrote: See attachment, 8 red,   8 green, (4 of which consist of two reds) 4 blue,   4 orange (consisting of two blues, which are shared)     I see 6 orange. IP Logged towr wu::riddles Moderator Uberpuzzler Some people are average, some are just mean.     Gender: Posts: 13730 Re: Triangles   « Reply #23 on: Sep 27th, 2013, 7:48am » Quote Modify on Sep 27th, 2013, 7:39am, SEMfuze wrote: I see 6 orange. Then you're probably misinterpreting the figure. Each orange-type triangle consists of 3 vertices of the main square; as it only has 4 vertices, there can only be 4 such triangles. IP Logged Wikipedia, Google, Mathworld, Integer sequence DB Nursejim Junior Member The 1 Inch Punch     Gender: Posts: 53 Re: Triangles   « Reply #24 on: Sep 27th, 2013, 7:51pm » Quote Modify Yeah there are more than 4 triangles in the orange figure but that not what it means. There are 4 of the orange "size" triangles in the whole figure. Alot of these types of puzzles  were on the asvab when I tested years back. Fun stuff. IP Logged Advanced Sales Funnel System Pages: 1 2  Reply Notify of replies Send Topic Print Forum Jump: ----------------------------- riddles -----------------------------=> easy   - medium   - hard   - what am i   - what happened   - microsoft   - cs   - putnam exam (pure math)   - suggestions, help, and FAQ   - general problem-solving / chatting / whatever ----------------------------- general -----------------------------  - guestbook   - truth   - complex analysis   - wanted   - psychology   - chinese « Previous topic | Next topic »

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