Circumference in 7th Grade Math

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In this lesson, students will learn about the concept of circumference in 7th-grade math. The lesson covers definitions of radius, diameter, and the use of Pi in calculating circumference. Different formulas for finding circumference based on diameter or radius are explained with examples. Students are encouraged to engage in problem-solving using the formulas provided in the lesson.

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02.06.2018 Agenda Ticket in the Door Take out your Avid Binder Turn to the math Section Write down your daily Agenda Ticket in the door Cornell notes Wrap-up

CIRCUMFERENCE 7thGrade

Circumference Introduction https://www.youtube.com/watch?v=cC0fZ_lkFpQ

The circumference of a circle is The distance around a circle Hint: Circumference remember circle around

First we must define some things about a circle. The radius is the distance from the center of a circle to any point on a circle. Hint: I like to define it as halfway through!

The diameter is the distance across a circle through the center.

We use Pi as the measurement to help us find the circumference of a circle. Pi, not Pie!

HINT: Pi =3.14

Two formulas are used in finding the circumference of a circle. WHEN THE CIRCLE HAS A DIAMETER MEASUREMENT, USE THE FOLLOWING FORMULA. Circumference = d 4in. 3.14 x 4in. 12.6in.

When the radius of a circle is given, the following formula should be used. Circumference = 2 r 2 x 3.14 x 5cm 31.4cm HINT: Always round your answers to the nearest tenth.