HSC Stuff > HSC Mathematics Extension 1

Math Ext 1 - Cyclic Quadrilateral Q (ii)

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helkit98:
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:

--- Quote from: helkit98 on October 23, 2016, 08:24:15 pm ---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.

--- End quote ---

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!

RuiAce:

--- Quote from: helkit98 on October 23, 2016, 08:24:15 pm ---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.

--- End quote ---



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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