Lesson 1- Vertical Angles Explanation This website explains vertical angles really well. It also provides worksheets that are simple but could be used as extra practice if a student is struggling
Lesson 2- Alternate Interior Angles Explanation This site explains the property of alternate interior angles. It also includes a video and some activities that could be used if a child needs extra practice outside of school.
Lesson 3- Perpendicular Bisector Explanation This site explains what a perpendicular bisector is, how it works, and gives some examples. It also shows the construction, which is useful information for a different unit covered in this grade. It has some examples for extra practice with your child.