Lines, Angles, and Shapes
Grade 9th Grade · Math · 45 min· I-ready Math
What's Included
Learning Objective
I can construct geometric shapes using appropriate tools and describe their properties related to lines and angles.
Warm-Up Video
Khan Academy · 4:09
Geometric constructions: congruent angles | Congruence | High school geometry | Khan Academy
Guided Notes
3 key concepts
- 1
A compass is a tool used to draw perfect circles or arcs with a constant radius.
- 2
To construct a congruent angle, first draw an arc that intersects both rays of the original angle, keeping the compass radius constant when drawing a similar arc on the new angle.
- 3
If all three sides of two triangles are congruent, then the corresponding angles must also be congruent.
Practice Questions
10 questions · Multiple choice & Short answer
Exit Ticket
Quick comprehension check
“Using a compass and straightedge, construct an angle congruent to the angle ∠PQR. Label the new angle ∠XYZ, clearly showing all arcs used in the construction.”
Complete Lesson Package
Get all 3 ready-to-use resources:
