JIB Posted May 27, 2011 Report Share Posted May 27, 2011 Will someone help me with this IA? I can see that AO and AP' are equal because they are both radiuses of C3, but I don't understand how you can solve for OP' without a given angle! please help! Reply Link to post Share on other sites More sharing options...
Ice Cream is really yummy Posted May 27, 2011 Report Share Posted May 27, 2011 Will someone help me with this IA? I can see that AO and AP' are equal because they are both radiuses of C3, but I don't understand how you can solve for OP' without a given angle! please help! How much is this question worth? If it's +5 points, that probably means that you need to "think" a little harder because the question requires at least two different steps. So, maybe you need to use two different equations to find your answer Reply Link to post Share on other sites More sharing options...
JIB Posted May 27, 2011 Author Report Share Posted May 27, 2011 it doesnt say how many points is worth but i really need help from someone who has looked at it. Reply Link to post Share on other sites More sharing options...
Ice Cream is really yummy Posted May 27, 2011 Report Share Posted May 27, 2011 (edited) I have not seen it yet, I'm sorry But I can still try to help How about the 3 law/rules in a circle? When a line (segment?) is adjecent to the circle... those ones. The IB should be pretty clear when it comes to their questions... Edited May 27, 2011 by egr12resa Reply Link to post Share on other sites More sharing options...
dessskris Posted May 27, 2011 Report Share Posted May 27, 2011 which IA is this? can you attach the task paper? I can try and help. Reply Link to post Share on other sites More sharing options...
deissi Posted May 28, 2011 Report Share Posted May 28, 2011 Will someone help me with this IA? I can see that AO and AP' are equal because they are both radiuses of C3, but I don't understand how you can solve for OP' without a given angle! please help! How much is this question worth? If it's +5 points, that probably means that you need to "think" a little harder because the question requires at least two different steps. So, maybe you need to use two different equations to find your answer This isn't a normal maths exam question, it's part of the IA, which is composed of multiple questions. Take a look at some example IAs (I think there are some on the forum) and you'll understand that it's a whole other world. Reply Link to post Share on other sites More sharing options...
dessskris Posted May 29, 2011 Report Share Posted May 29, 2011 Will someone help me with this IA? I can see that AO and AP' are equal because they are both radiuses of C3, but I don't understand how you can solve for OP' without a given angle! please help! sorry for the very late reply! I've been busy very lazy lately okay so you know there is this AOP triangle with AOP' triangle inside, and both are isosceles triangles (AP=OP, AO=AP'). I've drawn something to guide you. look at the picture below: the figure on the left hand side is exactly as it is shown in the task paper, except for being rotated so that you can clearly see that it's isosceles. when you rotate the inner triangle, you'll get the figure on the right hand side. now you see that the two triangles are actually similar. so you can work out the lengths of the triangles without having to deal with angles! do you know what to do now? Reply Link to post Share on other sites More sharing options...
rena lee Posted June 13, 2011 Report Share Posted June 13, 2011 which IA is this? can you attach the task paper? I can try and help.you can check CIRCLES. Reply Link to post Share on other sites More sharing options...
dessskris Posted June 13, 2011 Report Share Posted June 13, 2011 well I have already got the task paper so never mind that post Reply Link to post Share on other sites More sharing options...
pinkiebloo Posted June 13, 2011 Report Share Posted June 13, 2011 i have a question... i can see that triangle OAP and OAP' are both isoscles. and if AP= OP and AO= AP' then OA=AP'=1 because the radius for c3 is 1. and when OP= 2, then OP=AP= 2 but then how can AP= 2, when the radius for c3 is 1? i'm really lost i need help pleasseeeee! Reply Link to post Share on other sites More sharing options...
dessskris Posted June 13, 2011 Report Share Posted June 13, 2011 because AP is not the radius of C3...? Reply Link to post Share on other sites More sharing options...
pinkiebloo Posted June 13, 2011 Report Share Posted June 13, 2011 because AP is not the radius of C3...? hmm yeah i know that AP is not the radius of c3....but.. never mind it's hard to explain and i think i got it.. hehe thanks anyway Reply Link to post Share on other sites More sharing options...
Laraa Posted July 16, 2011 Report Share Posted July 16, 2011 Will someone help me with this IA? I can see that AO and AP' are equal because they are both radiuses of C3, but I don't understand how you can solve for OP' without a given angle! please help! sorry for the very late reply! I've been busy very lazy lately okay so you know there is this AOP triangle with AOP' triangle inside, and both are isosceles triangles (AP=OP, AO=AP'). I've drawn something to guide you. look at the picture below: the figure on the left hand side is exactly as it is shown in the task paper, except for being rotated so that you can clearly see that it's isosceles. when you rotate the inner triangle, you'll get the figure on the right hand side. now you see that the two triangles are actually similar. so you can work out the lengths of the triangles without having to deal with angles! do you know what to do now? but I still need to know the angle in order to get the length of OP' right? or issit just based on ratios? Reply Link to post Share on other sites More sharing options...
dessskris Posted July 16, 2011 Report Share Posted July 16, 2011 I said "so you can work out the lengths of the triangles without having to deal with angles!"because of similarity.remember similarity and congruency? Reply Link to post Share on other sites More sharing options...
vivesta Posted September 23, 2011 Report Share Posted September 23, 2011 Will someone help me with this IA? I can see that AO and AP' are equal because they are both radiuses of C3, but I don't understand how you can solve for OP' without a given angle! please help! I have just been given this IA, was wondering if there are any useful points that you could help out with since you have already gone through it !!!! pleeeaaasseeeee? Reply Link to post Share on other sites More sharing options...
vivesta Posted September 23, 2011 Report Share Posted September 23, 2011 because AP is not the radius of C3...? hmm yeah i know that AP is not the radius of c3....but.. never mind it's hard to explain and i think i got it.. hehe thanks anyway T_T can u PLEAASE care to explain? and save my mysery? Reply Link to post Share on other sites More sharing options...
dessskris Posted September 23, 2011 Report Share Posted September 23, 2011 (edited) I'm pretty sure I've written all the necessary clues in post #7. can you just read them first? if you have, read again every single word and try to understand it. if you only skim through you will never understand anything.then if you have other questions you can just post it here. but please be specific! I can't be explaining the whole thing again. tell me which part you don't understand and then I'll explain it to you. Edited September 23, 2011 by Desy Glau Reply Link to post Share on other sites More sharing options...
illCyz Posted October 3, 2011 Report Share Posted October 3, 2011 (edited) I was thinking of using similar triagles as well, but the first task clearly states to "Use a trigonometric approach to find OP', when OP=2, OP=3, and OP=4". If similar triangles don't fall under trigonometry then I won't be able to use such an approach for this task right?Edit: Or do similar triangles DO fall under trigonometry? I always thought trigonometry meant using sin, cos, tan, etc. Edited October 3, 2011 by illCyz Reply Link to post Share on other sites More sharing options...
dessskris Posted October 5, 2011 Report Share Posted October 5, 2011 trigonometric approach does involve sin cos tan but might not be pure sin cos tan. maybe you can use sine rule or sth? I honestly have no idea :/ Reply Link to post Share on other sites More sharing options...
vivesta Posted October 5, 2011 Report Share Posted October 5, 2011 ooh.. really... it seems like we received different task sheets... because mine didn't mention using trigonometric approaches anywhereI was thinking of using similar triagles as well, but the first task clearly states to "Use a trigonometric approach to find OP', when OP=2, OP=3, and OP=4". If similar triangles don't fall under trigonometry then I won't be able to use such an approach for this task right?Edit: Or do similar triangles DO fall under trigonometry? I always thought trigonometry meant using sin, cos, tan, etc. 1 Reply Link to post Share on other sites More sharing options...
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