Take out a ruler and your calculator. Put your 6.1 worksheet on your desk to be

stamped. Find the missing angle measure and any

missing side lengths.

Do Now

The Circumference/ Diameter Ratio

Pi

Calculate pi, the ratio of the circumference of a circle to its diameter.

Use the ratio pi to find missing distances. Use problem solving skills.

Today’s Objectives

Perimeter Circumference

The distance around a polygon is called the perimeter

The distance around a circle is called the circumference

Height of a tennis ball can?

Circumference of the canister?

Which is greater?

Let’s try it !!!

The circumference of the canister is greater than the height of the canister or three tennis balls.

The taste of pi In this investigation you will find an

approximate value for π by measuring circular objects and calculating the ratio of the circumference to the diameter. Lets see how close you come to the actual value of π.

Object Circumference

Diameter Ratio C/d

PracticeThe distance from the center of a Ferris wheel to one of the seats is approximately 90 ft, what is the distance traveled by a seated person, to the nearest foot, in one revolution?

Partner challengeShow your work and explain your reasoning.

Calculate pi, the ratio of the circumference of a circle to its diameter.

Use the ratio pi to find missing distances. Use problem solving skills.

Today’s Objectives

1. If a circle has diameter of 13cm, what is its circumference?

2. If a circle has a circumference of 25cm, what is its radius?

Exit Slip

Honors Exit Slip (Period 5)Show your work and explain your reasoning.

1. If a circle has a circumference of 25cm, what is its radius?

2. If the distance from the center of a Ferris wheel to one of the seats is approximately 45ft, what is the distance traveled by a seated person, to the nearest foot, in one revolution?

Honors Exit Slip (Period 2)