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July 21, 2017, 06:47:41 am

Author Topic: Math Ext 1 - Cyclic Quadrilateral Q (ii)  (Read 230 times)  Share 

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helkit98

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Math Ext 1 - Cyclic Quadrilateral Q (ii)
« on: October 23, 2016, 08:24:15 pm »
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Don't understand part ii of this question. I understand how angleCDA and angleAOC are 2x but don't get how this makes ACDO cyclic.

jakesilove

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Re: Math Ext 1 - Cyclic Quadrilateral Q (ii)
« Reply #1 on: October 23, 2016, 08:27:04 pm »
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Don't understand part ii of this question. I understand how angleCDA and angleAOC are 2x but don't get how this makes ACDO cyclic.

Hey! Looks like you've actually completed the proof; draw a circle around the supposed CQ, and you'll find that, based on your proof, angle subtending the same arc are equal. This will only be true for a CQ, therefore a CQ is what we have!
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RuiAce

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Re: Math Ext 1 - Cyclic Quadrilateral Q (ii)
« Reply #2 on: October 23, 2016, 08:28:28 pm »
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Don't understand part ii of this question. I understand how angleCDA and angleAOC are 2x but don't get how this makes ACDO cyclic.



I can let out a vent on maths in focus here. For some fucking reason it's not covered in that textbook.
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