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We created this parts of a right triangle interactive notebook page to start off our unit on right triangle trigonometry.

Each student had to cut a right triangle out of colored paper and glue it into their notebooks. We labeled one of the non-90 degree angles as theta. Then, we discussed how to identify the adjacent and opposite sides as well as the hypotenuse.

This is my students’ first experience with these terms because the geometry teacher they had did not teach any right triangle trig. It’s a long story, but this trig class is the first time my students have ever seen any trig.

My greek alphabet posters are perfect for showing my students where theta comes from.

## More Activities for Teaching Trigonometry

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