Exercises: Triangle Congruence Criteria from Rigid Motions

Work through each section in order. For explanation problems, use complete sentences and reference rigid motions where relevant.

Grade 9·21 problems·~30 min·Common Core Math - HS Geometry·standard·hsg-co-b-8

Work through problems with immediate feedback

Warm-Up: Review What You Know

These problems review prerequisite skills from CO.B.6, CO.B.7, and Grade 8 geometry.

In triangle $\triangle PQR$ , $\angle P = 48^\circ$ and $\angle Q = 75^\circ$ . What is the measure of $\angle R$ ?

$57^\circ$

$123^\circ$

$67^\circ$

$48^\circ$