Start the exploration of trigonometry off right! Pupils build on their understanding of similarity in this lesson that introduces the three trigonometric ratios. They first learn to identify opposite and adjacent...

Introduce your classes to a new world of mathematics. Pupils learn to call trigonometric ratios by their given names: sine, cosine, and tangent. They find ratios and use known ratios to discover missing sides of similar...

What does geometry have to do with depression? It's an angle of course! Learners apply the tangent ratio to problem solving questions by finding missing lengths. Problems include angles of elevation and angles of depression. Pupils make...

What do you do when you don't think you have enough information? You look for another way to do the problem! Pupils combine what they know about finding the area of a triangle and trigonometry to determine triangle area when they don't...

Breaking the law in math doesn't get you jail time, but it does get you a wrong answer! After developing the Law of Sines and Cosines in lesson 33 of 36, the resource asks learners to apply the laws to different situations. Pupils must...

How do you solve an equation like trigonometry? Learners apply their understanding of trigonometric ratios to find unknown angles in right triangles. They learn the meaning of arcsine, arccosine, and arctangent. Problems include...

Make up your mind to complete a lesson plan about "The Tell-Tale Heart" and forever rid yourself of simple sentence structures. As ninth graders analyze the first two paragraphs of Edgar Allan Poe's short story, they consider how text...

Hearken! and observe how well a literary analysis unit can help ninth graders read closely and connect text structure to a central idea. Focusing on Edgar Allan Poe's "The Tell-Tale Heart," learners take notes and track the development...

Eager readers have waited a long time, very patiently, for a set of literary analysis lessons that connect text structure to the work's central idea. As ninth graders continue reading "The Tell-Tale Heart," they focus on the central...

Continue a thoughtful analysis of Sophocles' Oedipus the King by discussing the importance of dialogue within the play's structure. Ninth graders examine how Oedipus speaks about himself to his subjects and Creon before recording their...

How can a prophecy be true if the future differs from what was foreseen? Sophocles entertains this question in Oedipus the King. Teiresias, Creon, and Oedipus have weighed in on the unsolved murder of Laius, and now Jocasta voices her...

As Oedipus the King approaches its tragic conclusion, high schoolers discuss Oedipus' reaction to seeing his wife's body. They also examine how Sophocles structures the scene to contribute to the central idea of his play.

What if I can no longer justify area by counting squares? Lead a class discussion to find the area of a rectangular region with irrational side lengths. The class continues on with the idea of lower approximations and...

Using a similar process from the first lesson in the series of finding area approximations, a measurement resource develops the proof of the area of a circle. The problem set contains a derivation of the proof of the circumference...

"True-crime stories, murder mysteries, up-to-the-minute online news reports, and (as always) rumor and innuendo grab our attention faster than any call for justice, human rights, or ceasefires." Or so says Walter Mosley in his Newsweek...

A diameter is the longest chord possible, but that's not the only relationship between chords and diameters! Young geometry pupils construct perpendicular bisectors of chords to develop a conjecture about the relationships between chords...

You've investigated relationships between chords, radii, and diameters—now it's time for arcs. Learners investigate relationships between arcs and chords. Learners then prove that congruent chords have congruent arcs, congruent arcs have...

What does completing the square have to do with circles? Math pupils use completing the square and other algebraic techniques to rewrite equations of circles in center-radius form. They then analyze equations of the form x^2 + y^2 + Ax +...

Don't give your classes the third degree when working with polynomials! Teach them to recognize the successive differences and identify the degree of the polynomial. The lesson leads learners through a process to develop an understanding...

If you can multiply multi-digit integers, you can multiply polynomials. Learners use an area model to compare multiplying numbers to multiplying polynomials. They progress to using the distributive property. 

Learners solve complex radical equations. Solutions vary from one, two, and none, allowing pupils to gain experience solving a variety of problems.

Through discussions and journaling, classmates determine methods to associate types of functions with data presented in a table. Small groups then work with examples and exercises to refine their methods and find functions that work...

Reduce variability for more accurate statistics. Through simulation, learners examine sample data and calculate a sample mean. They understand that increasing the number of samples creates results that are more representative of the...

Triangles, triangles, and more triangles! In this second installment of a 36-part series, your young mathematicians explore two increasingly challenging constructions, requiring them to develop a way to construct three triangles that...