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

Warm-Up: Review What You Know

These problems review skills you already have.

Triangle $ABC$ has $AB = AC$ . An angle bisector is drawn from $A$ to point $D$ on $\overline{BC}$ . Which congruence criterion proves $\triangle ABD \cong \triangle ACD$ ?

SSS (Side-Side-Side)

ASA (Angle-Side-Angle)

SAS (Side-Angle-Side)

AAS (Angle-Angle-Side)