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## Interesting Triangle

Gregory Taylor sends this along, and asks a really great question about the work:

“Look past the problem of the original triangle having no 90 degrees… they know enough to run a (problematic) check on height to investigate ambiguity of sine.  Why would they even do that if they thought it was a right triangle?”

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## You ready for some more trig identities?

Thanks to Tina Cardone for her pile of trig submissions.

How would you help this student?

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## Amplitude and Period

What does this student know? How would you take the kid to the next level?

Thanks to the Ultimate Tina Cardone for her excellent submissions. Her reign of terror over this blog will end soon!

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## Law of Sines

Courtesy of Tina Cardone and presented without comment.

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## sin(75) = …

What do these responses reveal about what the students know about trig? Or just comment about what you find interesting here.

Thanks to the Incredible Tina Cardone for the submissions.

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## QED?

What’s the fastest way to help this student?

Do you have a good way to help students understand the rigor needed in these sort of proofs?

Thanks to Jonathan Newman for the submission.

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## A Sneaky Simplifying Mistake

This is a fun mistake, via Jonathan Newman. Find it, and then explain how you’d help the kid who made it.

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## Inverse Trig Functions

How would you help these students?

Thanks to Tina Cardone for the submissions. Head over to the Productive Struggle blog for further analysis and discussion of these questions.

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## “1 + 1 = 1 ????”

What’s the fastest way of helping this student?

Thanks to Jonathan Newman for the submission. You should click on his name to go to his blog.

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## Same Question, Different Mistake

Compare to this post.

Are there any other mistakes that you would expect students to make on this problem?

Thanks to Kristen Fouss for the submission.