Exercises: Prove Theorems About Lines and Angles

Work through each section in order. For proof problems, show each step with its justification. Express angle measures in degrees.

Grade 9·21 problems·~35 min·Common Core Math - HS Geometry·standard·hsg-co-c-9

Work through problems with immediate feedback

Warm-Up: Review What You Know

These problems review skills you already know.

Segment $\overline{AB}$ has midpoint $M$ . A line through $M$ is perpendicular to $\overline{AB}$ . Which term names this line?

Angle bisector of $\angle AMB$

Perpendicular bisector of $\overline{AB}$

Median of triangle $AMB$

Altitude of $\overline{AB}$