Geometry

Lesson 7

Math

Unit 6

7th Grade

Lesson 7 of 21

Objective


Solve real-world and mathematical problems using the relationship between the circumference of a circle and its diameter. 

Common Core Standards


Core Standards

  • 7.G.B.4 — Know the formulas for the area and circumference of a circle and use them to solve problems; give an informal derivation of the relationship between the circumference and area of a circle.

Foundational Standards

  • 4.MD.A.3

Criteria for Success


  1. Know the formula that relates the circumference and diameter of a circle: $${{C=\pi d}.}$$
  2. Use the formula $${C=\pi d}$$ to solve problems.
  3. Understand that the distance around a closed semi-circle is half of the circumference added to the diameter of the circle.

Tips for Teachers


Lessons 6 and 7 focus on the relationship between a circle’s circumference and its diameter. In Lesson 7, students solve real-world and mathematical problems involving circumference, including problems involving semi-circles.

Fishtank Plus

Unlock features to optimize your prep time, plan engaging lessons, and monitor student progress.

Anchor Problems


Problem 1

Basil saw a strange old bicycle at the museum. It had one very big wheel and one very small one. 

At home, Basil looked it up on the Internet and found that the big wheel could have a 52-inch diameter and the small wheel could have an 18-inch diameter. 

a.   Using the measurements that Basil found, what is the circumference of the big wheel?

b.   How far would you travel in one turn of the big wheel? Give your answer in feet and inches.

c.   How many times must the cyclist turn the big wheel to travel 1 mile? A mile is 1,760 yards. Give your answer to the nearest 10 turns.

d.   How many times does the small wheel turn when the cycle travels 1 mile?

Guiding Questions

Create a free account or sign in to access the Guiding Questions for this Anchor Problem.

References

MARS Summative Assessment Tasks for Middle School Historic Bicycle

Historic Bicycle from the Summative Assessment Tasks for Middle School is made available through the Mathematics Assessment Project under the CC BY-NC-ND 3.0 license. Copyright © 2007-2015 Mathematics Assessment Resource Service, University of Nottingham. Accessed March 10, 2018, 11:11 a.m..

Problem 2

Two figures are shown below. Figure A is a semi-circle, and Figure B is composed of a square and two semi-circles. 

Find the distance around each figure. 

Guiding Questions

Create a free account or sign in to access the Guiding Questions for this Anchor Problem.

Problem Set

Fishtank Plus Content

Give your students more opportunities to practice the skills in this lesson with a downloadable problem set aligned to the daily objective.

Target Task


New plants and bushes are to be planted along a path that goes around a park. The shape of the park is shown below. What is the distance around the park?

Student Response

Create a free account or sign in to view Student Response

Additional Practice


The following resources include problems and activities aligned to the objective of the lesson that can be used for additional practice or to create your own problem set.

icon/arrow/right/large copy

Lesson 6

icon/arrow/right/large

Lesson 8

Lesson Map

A7CB09C2-D12F-4F55-80DB-37298FF0A765

Topic A: Angle Relationships

Topic B: Circles

Topic C: Building Polygons and Triangles

Topic D: Solid Figures

Request a Demo

See all of the features of Fishtank in action and begin the conversation about adoption.

Learn more about Fishtank Learning School Adoption.

Contact Information

School Information

What courses are you interested in?

ELA

Math

Are you interested in onboarding professional learning for your teachers and instructional leaders?

Yes

No

Any other information you would like to provide about your school?

Effective Instruction Made Easy

Effective Instruction Made Easy

Access rigorous, relevant, and adaptable math lesson plans for free