Back to Prove theorems about triangles — Problem 2 · Task Set 10
Exercises: Prove Theorems About Triangles
Work through each section in order. Show your reasoning for proof-based problems.
Grade 9·21 problems·~35 min·Common Core Math - HS Geometry·standard·hsg-co-c-10
Work through problems with immediate feedback
A
Fluency Practice
Apply the triangle theorems directly to find missing values.
1.
Which theorem from HSG.CO.C.9 is the essential step in the proof of the Triangle Angle Sum Theorem?