Angles of Triangles (Day 2)
Lesson Prep
Lesson Details
Duration: 50 minutes
Learning Goal: Develop understanding of the features of isosceles triangles and corresponding sides and angles in triangles.
Answer Keys
Classwork
1:1 Devices Version
Desmos activity for warm up and isosceles triangles handout
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