An old chestnut. Good as an extension or a challenge. I use it at the end of a lesson to see which pairs of similar triangles they can see (there are many). I find that many pupils correctly guess the height (2/3) but are unable to prove it. The steps in this PowerPoint should help.
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Excellent. I like the hints.
Nice!
Great extension for my MAT pupils! Thank you!
Excellent - a useful extension for my Year 10 class. I especially like the progressive slides developing the hints. Thank you for sharing.
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