standard_description: Derive using similarity the fact that the length of the arc intercepted by an angle is proportional to the radius, and define the radian measure of the angle as the constant of proportionality; derive the formula for the area of a sector.
problem_activity: Narrative
The purpose of this activity is for students to choose from activities that focus on adding and subtracting within 100. Students may also choose to continue working on Picture Books as one of their choices.
Students choose from any stage of previously introduced centers.
Capture Squares
Number Puzzles
Picture Books
Required Materials
Materials to Gather
Materials from previous centers
Required Preparation
Gather materials from:
Capture Squares, Stages 3
–
4
Number Puzzles, Stages 2
–
4
Picture Books, Stage 3
Launch
“Now you will choose from centers we have already learned. One of the choices is to continue with Picture Books.”
Display the center choices in the student book.
“Think about what you would like to do first.”
30 seconds: quiet think time
Activity
Invite students to work at the center of their choice.
10 minutes: center work time
“Choose what you would like to do next.”
10 minutes: center work time
Student Facing
Choose a center.
Capture Squares
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Number Puzzles
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Picture Books
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Activity Synthesis
“What did you like about the activities you worked on today?”


aligns: no