Midsegments of Triangles - IXL 8GT
Perpendicular & Angle Bisectors - IXL GWE
Identify Medians, Altitudes, Angle Bisectors, and Perpendicular Bisectors - IXL JWN
Angle-Side Relationships in Triangles - IXL ZN8
Triangle Inequality Theorem - IXL BW7
Construct the Circumcenter or Incenter of a Triangle - IXL EC6
Construct the Centroid or Orthocenter of a Triangle - IXL X8X
Proofs Involving Triangles I - IXL G78
Proofs Involving Triangles II - IXL DUQ