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C3 Right Angled Triangle Proof Chapter 6

I'm struggling to see how triangle ACB is a right angled triangle. I know that CB is a chord but I might be silly.

This is in my attachment.

How is the angle ACB a right angle?
Screen Shot 2016-07-15 at 21.10.58.png18.4KB
Reply 1
Avatar for Zacken
Zacken
22
Original post by nwmyname
I'm struggling to see how triangle ACB is a right angled triangle. I know that CB is a chord but I might be silly.


GCSE circle theorems, any triangle with a vertex on the circumference and one side as the diameter is a right angle, or however it's said.
Reply 2
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nwmyname
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13
Original post by zacken
gcse circle theorems, any triangle with a vertex on the circumference and one side as the diameter is a right angle, or however it's said.


oh yeah thanks omd
Reply 3
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Zacken
22
Original post by nwmyname
oh yeah thanks omd


No worries.

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