Mr. Ohashi's Math 8 Website

Eighth Grade Math at Eckstein Middle School

Tag Archives: parallel lines

Friday, 6/2: Angle Relationships (Day 5 of 14)

Learning Target: Use angle relationships to identify angle measures.
Handouts: More with Angle Relationships (Turn in: Mon, 6/5)

We started today by writing down the rule for triangle similarity. We know that if two angles of one triangle match two angles of another triangle, then the third angles must also match and the two triangles must be similar!

Yesterday, we looked at the pattern of angles formed when parallel lines are intersected by another line. There are names for each of these angle relationships! Today, we completed the back page of our notes that have all of the angle relationships in pictures!

If you’d like to see a video describing these relationships, check it out here:

We also had some problems where a triangle was intersected by a line that was parallel to one of its sides. We found that this always creates a similar smaller triangle!

In class, you had to complete #1-6. There is no additional homework, so have a great weekend!

Thursday, 6/1: Parallel Lines and Angles (Day 4 of 14)

Learning Target: Explore parallel lines in order to discover more angle relationships.
Handouts: Angles & Parallel Lines (Turn in: Fri, 6/2)

Today we learned some more angle relationships. When two lines intersect, the angles across from each are equal. Those angles are called vertical angles.

We also looked at the angles that are formed when parallel lines are intersected by another line (a transversal). This forms eight angles with a pattern. The first group of four angles is exactly the same as the second group of four angles!

We wrote the following down in our notes:

If you want to see those patterns visually, check out the video…

In class, you should have finished at least #1-7. There is no additional homework!