IM Geometry Unit 2 Lesson 9
Construct a triangle with the given side lengths using technology.
Side lengths:
- 2 cm
- 1.5 cm
- 2.4 cm
Can you make a triangle that doesn’t look like anyone else’s?
Priya was given this task to complete:
Use a sequence of rigid motions to take STU to GHJ. (Mark the congruent parts with the pen tool.)
ST is congruent to GH.
TU is congruent to HJ.
SU is congruent to GJ.
Using the construction tools, use rigid transformations to match triangle STU onto triangle GHJ. What transformations did you do?
Finish a few sentence summary of this proof. "To prove 2 triangles must be congruent if all 3 pairs of corresponding sides are congruent there is . . ."
Quadrilateral ABCD is a parallelogram. By definitions, that means that segment AB is parallel to segment CD, and segment BC is parallel to segment AD.
Use the pen tool to mark the congruent line segments.
What can you do to prove that Angle B is congruent to angle D?
IM G Unit 2 Lesson 9 from IM Geometry by Illustrative Mathematics, https://im.kendallhunt.com/HS/students/2/2/9/index.html. Licensed under the Creative Commons Attribution 4.0 license, https://creativecommons.org/licenses/by/4.0/.