Q2, W9 Geometry: December 17-19

TeacherKristin Andreason
Subject AreaGeometry Honors
Grade Level8
Week #December 17-19
Unit of InstructionUnit 4: Right Triangles and Trigonometry
Standard(s) Taught

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

MAFS.912.G-SRT.3.6:  Understand that by similarity, side ratios in right triangles are properties of the angles in the triangle, leading to definitions of trigonometric ratios for acute angles.

MAFS.912.G-SRT.3.7:  Explain and use the relationship between the sine and cosine of complementary angles.

Learning Targets and Learning Criteria
  • Students will demonstrate that within a right triangle, line segments parallel to a leg create similar triangles by angle-angle similarity.
  • Students will be able to use characteristics of similar figures to justify the trigonometric ratios.
  • Students will define the following trigonometric ratios for acute angles in a right triangle:  sine, cosine, and tangent.
  • Students will be able to calculate sine and cosine ratios for acute angles in a right triangle when given two side lengths.
  • Students will understand that for a pair of complementary angles A and B in a right triangle, the sine of angle A is equal to the cosine of angle B and the cosine of angle A is equal to the sine of angle B.
  • Students will solve application problems involving right triangles, including angle of elevation and depression.
  • Students will 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.
Classroom Activities


  • Students will take the SMT for the second time to see what they have learned this semester.


  • This day will be used to finish up any missing assignments.
Assignments Due
  • SMT will be taken on December 17/18.
Additional Resources