Visualizing Operations on Functions
For my Precalc kids, I started toying with this idea of presenting function operations using diagrams to help kids visually organize domain changes and to see how equations relate to one another. Here's stab #1 (we started doing this earlier this week. I plan on finishing this tomorrow and easing our way into composition of functions...). My reasoning for organizing it like this is to show kids that addition, subtraction, and multiplication are all very forgiving operations. As long as f(x)…
Equation: Blood Spatter a Math Matter
The forensics of blood spatters: A new formula using high school trig and introductory physics helps investigators determine whether a victim took a blow standing up.
Honing My Skills Instruction
Skills instruction was something that I was not good at when I first started teaching. I found it boring compared to big ideas and didn’t really understand why kids didn’t get things fr…
High School Trigonometry: Teaching Resources for Trigonometry
Teaching Resources for Trigonometry - findingDulcinea. Find resources for trigonometry lesson plans, worksheets, activities, curriculum planning and more.
Trig River - Activity
Students learn about and use a right triangle to determine the width of a "pretend" river. Working in teams, they estimate of the width of the river, measure it and compare their results with classmates.
What is an irrational number? Topics in precalculus
A rational number is any number of arithmetic. A proof that square root of 2 is not rational. What is a real number?