SME
Grade 7 Math
Circumference and area of circles
The main lesson, then each kind of problem it solves.
Circumference and area of circles
Main lesson
Circumference and wheels
Use this for “A 28-inch wheel turns 25 times. How far does the bike go?”
A circle in a square
Use this for “A circle of radius 5 is inside a square. What area is left in the corners?”
Circumference is proportional to diameter
Use this for “A circle has diameter 4. What is its circumference, and where is it on the graph?”
Circumference or area?
Use this for “Is it circumference or area?” before choosing the formula.