2.4 Proportional Lengths

By the end of this playlist I can...
-recognize when segments are divided proportionally
-recognize and apply the following theorems:
1. If a line parallel to one side of a triangle intersects the other two sides, then it divides those sides proportionally.
2. If 3 parallel lines intersect 2 transversals, then they divide the transversals proportionally.
3. If a ray bisects an angle of a triangle, then it divides the opposite side into segments proportional to the other two sides.

1

I've completed the video or mini-lesson on proportional lengths and feel confident that I understand the concept.

1

I've completed the video or mini-lesson on triangle proportionality and feel confident that I understand the concept.

10

Try a few of these practice problems on finding missing lengths in similar triangles. Move on when ready.

1

I've completed the Khan Academy practice problems on finding missing lengths in similar triangles.

1

I've completed the video or mini-lesson on 3 parallel lines intersected by 2 transversals and feel confident that I understand the concept.

1

I've completed the video or mini-lesson on proportional lengths and feel confident that I understand the concept.

I've completed the video or mini-lesson on triangle proportionality and feel confident that I understand the concept.

I've completed the Khan Academy practice problems on finding missing lengths in similar triangles.

I've completed the video or mini-lesson on 3 parallel lines intersected by 2 transversals and feel confident that I understand the concept.

I've completed the video or mini-lesson on the triangle angle-bisector theorem and feel confident that I understand the concept.