Angles of Triangles

Lesson Prep

Lesson Details

• Duration: 50 minutes

• Learning Goal: Use formative assessment to get a feel for student understanding of angles in triangles and then explore triangle angle properties.

Prework

• Make sure you have Chromebooks or some other class set of technology.

• Watch the following videos to learn more about our retake policy and how we go over quizzes

  • Retake Policy

  • Going Over Quizzes (embedded above)

Answer Keys

• Link to Answer Keys

Classwork

• Puzzling It Out (Desmos)

• Notes

• Go over Concept Quiz

  • Students complete this analysis handout in order to prepare for a retake.

Standards

Common Core

• HSG.CO.C.10 – Prove theorems about triangles. Theorems include: measures of interior angles of a triangle sum to 180°; base angles of isosceles triangles are congruent; the segment joining midpoints of two sides of a triangle is parallel to the third side and half the length; the medians of a triangle meet at a point.

TEKS

• G.6(D) – verify theorems about the relationships in triangles, including proof of the Pythagorean Theorem, the sum of interior angles, base angles of isosceles triangles, midsegments, and medians, and apply these relationships to solve problems