Circle theorems

[thorny cipher]

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[thorny cipher]

We’re supposed to find the diameter

[thorny cipher]

AB is the diameter

[neon jay]

You can use the chord-chord power theorem, which states that AO*OB=CO*OD, where O is the origin.

[thorny cipher]

Sorry what’s O here I don’t understand

I did this

And it becomes similar triangle because of angles subtended by the same arc theorem

5/4= 1.25

1.25x5=6.25

+4 is 10.25

[neon jay]

I meant to say centre of the circle, my bad

I've been doing a lot of coordinate stuff

[neon jay]

Yeah, you can also do that

[thorny cipher]

Oh it’s fine

[thorny cipher]

Does angles subtended by the same arc always lead to a similar triangle

[neon jay]

Yes, since those angles will be equal

[thorny cipher]

Alrrr thx

+close

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