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MC-II-A Question number 7.27 and 7.28

 
 
zhengEddy的头像
MC-II-A Question number 7.27 and 7.28
zhengEddy - 2018年10月28日 Sunday 15:15
 

I'm a bit confused on how to prove this , and I can't figure out where t start

 
ReynosoDavid的头像
Re: MC-II-A Question number 7.27 and 7.28
ReynosoDavid - 2018年10月29日 Monday 11:07
 

On 7.27 proceed similarly to 7.5. Try to write $\angle APB$ as the difference of two inscribed angles that open precisely to the arcs $\widehat{AB}$ and $\widehat{CD}$.


On 7.28 try finding some equilateral triangles in your diagram. (Extra hint: Since both cords $AB$ and $CD$ have the same length, what can you say about $AE$, $BE$, $CE$ and $DE$?)