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.

Point $D$ is the midpoint of $\overline{AB}$ , where $A = (0, 0)$ and $B = (8, 0)$ . What are the coordinates of $D$ ?

$(4, 0)$

$(2, 0)$

$(8, 0)$

$(0, 4)$