New Posts For Thread: maths helphttps://community.betfair.com/chit_chat/go/thread/view/94038/30464663/maths-helpMy my daughter needs to know how to work this math out.in a photograph the heights of 3 girls are 10cm, 9cm, and 7cm. The scale of the photo is 1:16 ,What is the real height of the tallest girl answer in metres.Blackbarn.https://community.betfair.com/chit_chat/go/thread/view/94038/30464663/maths-help?post_id=544063901#544063901Blackbarn.Tue, 24 Mar 2015 13:33:19 -0500Noah's Archttps://community.betfair.com/chit_chat/go/thread/view/94038/30464663/maths-help?post_id=544063115#544063115Noah's ArcTue, 24 Mar 2015 12:25:21 -0500If the girls WERE in a straight line...that would complicate matters severely. Much easier if they are positioned in an arc.https://community.betfair.com/chit_chat/go/thread/view/94038/30464663/maths-help?post_id=544062953#544062953If the girls WERE in a straight line...that would complicate matters severely. Much easier if they are positioned in an arc.Tue, 24 Mar 2015 12:12:12 -0500Were the 3 girls straight A students?And if they weren't all in a straight line as well, then it affects the answer, because it's a lot more difficult.You need to know Pythagoras like the back of you hand to work it out properly, or do like I do whenhttps://community.betfair.com/chit_chat/go/thread/view/94038/30464663/maths-help?post_id=544062331#544062331Were the 3 girls straight A students?And if they weren't all in a straight line as well, then it affects the answer, because it's a lot more difficult.You need to know Pythagoras like the back of you hand to work it out properly, or do like I do whenTue, 24 Mar 2015 11:25:00 -0500I will take back my remark about it being incredible simplehttps://community.betfair.com/chit_chat/go/thread/view/94038/30464663/maths-help?post_id=544062043#544062043I will take back my remark about it being incredible simpleTue, 24 Mar 2015 10:54:03 -0500You need the altitude, the geographical location, the camera characteristics (focal length, I think), the time of day and the apparent length of the shadow. Oh, and a pencil and a bit of paper! AND those Log tables that you threw out years ago!https://community.betfair.com/chit_chat/go/thread/view/94038/30464663/maths-help?post_id=544059799#544059799You need the altitude, the geographical location, the camera characteristics (focal length, I think), the time of day and the apparent length of the shadow. Oh, and a pencil and a bit of paper! AND those Log tables that you threw out years ago!Tue, 24 Mar 2015 06:29:54 -0500Actually I am not so sure about that now Naydam, the shadow, a long time since I was at schoolI will think about it later, more important stuff, now this afternoon's greyhoundshttps://community.betfair.com/chit_chat/go/thread/view/94038/30464663/maths-help?post_id=544059699#544059699Actually I am not so sure about that now Naydam, the shadow, a long time since I was at schoolI will think about it later, more important stuff, now this afternoon's greyhoundsTue, 24 Mar 2015 06:18:17 -0500I was assuming the plane had an altitude meter, it knows it's own height above the ground, the angle of the sunfrom that the length of the shadow can be deduced and thus height of rocket, basic trigstill I thought I was being clever get the answer tohttps://community.betfair.com/chit_chat/go/thread/view/94038/30464663/maths-help?post_id=544059583#544059583I was assuming the plane had an altitude meter, it knows it's own height above the ground, the angle of the sunfrom that the length of the shadow can be deduced and thus height of rocket, basic trigstill I thought I was being clever get the answer toTue, 24 Mar 2015 06:01:19 -0500Ebulgery. It's not all simple, really. It's not a simple matter of a bit of trig. The problem is that you don't know the actual length of the shadow either. The apparent size of the shadow depends upon the camera specifics and the altitude of the airhttps://community.betfair.com/chit_chat/go/thread/view/94038/30464663/maths-help?post_id=544056631#544056631Ebulgery. It's not all simple, really. It's not a simple matter of a bit of trig. The problem is that you don't know the actual length of the shadow either. The apparent size of the shadow depends upon the camera specifics and the altitude of the airMon, 23 Mar 2015 20:49:48 -0500It was not just 16 X 10you forgot the division by 100...immensely trickyhttps://community.betfair.com/chit_chat/go/thread/view/94038/30464663/maths-help?post_id=544056601#544056601It was not just 16 X 10you forgot the division by 100...immensely trickyMon, 23 Mar 2015 20:45:47 -0500