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are you there?

yeah

see if Qr=80 then, QPR=80/2

angle subtending arc= arc/2 (formula)

oh alright

so PQR=40

now,
using angles of triangles.
total angles (when added) =180
what we have here is 90+40+x=180

no its not 40

90+40(which we took out+x(which we have to find)=180
now solve for x, what do you get?

50

Good! Thatz your answer

ok thank you :)

No problem,

can you help me with one more?

I will try

hmmm.....

is it the second one?

nopes. I dont think that.
I think its D, but I am not sure.

ok, i'll just google it to be sure lol

okay....

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alright