The Triangle Troubleshooter

The SinCosTan cards for finding out why a trig answer does not match the key, and fixing it

Worksheets are sorted by topic. A student with a wrong answer only knows the symptom: the key says 111.8 degrees and the calculator said 68.2, or the key lists two triangles and the work found one. The Triangle Troubleshooter is sorted by symptom. Eight cards cover radian mode, choosing the law, SOH CAH TOA labels, the no-triangle case, the second triangle in the ambiguous case, the obtuse angle arcsin cannot return, early rounding, and the second angle inverse trig leaves out. Each names the cause, shows the wrong answer beside the right one, and gives the fix. Three checks follow: a thirty-second answer check, work laid out for partial credit, and a routine for test day. The back has a mistake log, a which-law card and ten practice triangles with answers. For students of trigonometry, and teachers, who may print the pages for their own students. With your purchase comes a personalised sheet that solves your own triangle, every solution included.

What’s inside

The full contents of The Triangle Troubleshooter: eight symptom cards, three checks, the working pages and three bonuses

Card 1, The Mode Rule: why a trig answer comes out wildly off or negative, with sin 30 in degree and radian mode

Card 1: an answer wildly off (radian mode)
Cards 2 and 3: which law, and SOH CAH TOA labels
Cards 4 and 5: no triangle, and the second triangle
Card 6: the obtuse angle arcsin cannot return
Cards 7 and 8: early rounding, and the missing second angle
Three checks: answers, partial credit, test day
A mistake log and a which-law card
Ten practice triangles with answers
A personalised sheet: your triangle, every solution

Plus a second PDF, worked out for you

Run one of the free calculators first and buy from that page, and this sheet is computed from your own figures. Buy from here and the pack still arrives complete — the sheet simply has no numbers of yours to work from yet.

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$12.00 including any taxes · PDF, 28 pages · instant download, link valid 7 days and 5 downloads.
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