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give me 5 minutes to think about it
have they given you an answer?
Its multiple choice, 101 96 200 192
OK that's good because one of those choices matches my answer
awesome, can you show me how its done
uhm im not really getting that, i have no idea what those little symbols mean so..
They are just angles
Can you see that d = 80 ?
Now d = α + γ ΟΚ?
Yea i see that
OK good, so α + γ = 80 Now can you see that 2γ + 99 = 180 ?
Kind of. when i did the math it didnt come up to be any of my answer choices
We have an isosceles triangle with the two base angles γ and the top angle of 99 thus they must all add up to 180 you see?
uhm no i get the concept but im not getting any of the answer choices.
Thats because we havent finished yet from here we can work out that γ = 40.5 ΟΚ?
Okay, yea 180 - 99 / 2 = 40.5 got it
ΟΚ so now we can work out α because α + γ = 80 and hence α = 39.5 but we also have a + 2α = 180 you see?
and from here we can work out a value for a! and there we are!
its all to do with the fact that all the lines drawn from the vertices of the cyc quadrilateral to the centre of the circle are equal and form 4 isosceles triangles
nice. thank you so much
thats fine, just go through my steps again and you'll gain a better understanding
its hard to describe using this method of communication. I usually do this one on one with my students and that way they really understand