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# C3 Right Angled Triangle Proof Chapter 6 Watch

1. 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?
Attached Images

2. (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.
3. (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
4. (Original post by nwmyname)
oh yeah thanks omd
No worries.

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