Q3, W3: January 17-21 Geometry

TeacherKristin Andreason
Subject AreaGeometry Honors
Grade Level8
Week #January 17-21
Unit of InstructionUnit 4: Right Triangles and Trigonometry
Standard(s) Taught

MAFS.912.G-SRT.2.4:  Prove theorems about triangles. (Theorems include: Triangle Proportionality Theorem or Side Splitter Theorem – a line parallel to one side of a triangle divides the other two proportionally.)

MAFS.912.G-SRT.3.8:  Use trigonometric ratios and the Pythagorean Theorem to solve right triangles in applied problems.

Learning Targets and Learning Criteria
  • define geometric mean.
  • find measures in similar right triangles using geometric mean.
  • apply theorems, postulates, or definitions to prove theorems about triangles, including proving The Pythagorean Theorem using triangle similarity.
  • use Special Right Triangles (30°-60°-90° and 45°-45°-90°) to solve for missing side lengths.
  • use angle measures to estimate side lengths and vice versa.
  • solve right triangles by finding the measures of all sides and angles in the triangles using Pythagorean Theorem and/or trigonometric ratios and their inverses.
  • draw right triangles that describe real world problems and label the sides and angles with their given measures.
  • solve application problems involving right triangles, including angle of elevation and depression, navigation, and surveying.
Classroom Activities


  • We will watch a video on Geometric Mean and one on Altitude Geometric Mean Theorem.
  • We will do Math Nation Section 7, Topic 6.
  • Students will do a Geometric Mean maze.


  1. We will do the packet on 45-45-90 Triangles.
  2. We will go over the concept of rationalizing the denominator
  3. I will give students notes on Simplifying Radicals–the Birthday Cake


  1. Third period will take the PSAT
  2. Fifth period will do the work that Third period did on Tuesday (flipped schedule)
Assignments Due
  • Practice Problems on 45-45-90 Triangles Packet.
Additional Resources

All IEP and ESOL accommodations are provided daily.