Pi and Diameter Part 2 Lesson Slides: 3 Slides (8th Grade)

3 Slides • 7 Questions

1

Open Ended

What is something that always makes you laugh?

Type response here

2

Match

Recall:

Match the following

Radius

Diameter

Chord

Circumference

1/2 of the Diameter

Distance from the center to the edge of a circle

Distance across a circle through its center

Line segment with both endpoints on the circle

Distance around the edge of a circle

Distance from the center to the edge of a circle divided by 2

3

Circle Circumference and Area

Standard:
MA.7.GR.1.3 Explore the proportional relationship between circumferences and diameters of circles. Apply a formula for the circumference of a circle to solve mathematical and real-world problems.

4

An important question.

5

Circumference & Area

6

Multiple Choice

I Do:

I measured from the center of the wheel to the outside edge and it was 62.2 cm. What is the circumference of the wheel? Use 3.14 for pi.

1

62.2 cm

2

195.308 cm

3

124.4 cm

4

390.616 cm

7

Multiple Choice

I Do:

Find the circumference of the circle

1

50.24 yd

2

25.12 yd

3

11.14 yd

8

Multiple Choice

We Do:

I wrapped a tape measure around the trunk of the tree and it was 10 feet. What is the diameter of the tree? Use 3.14 for pi. Round to the nearest hundredth.

1

1.59 ft

2

31.4 ft

3

3.18 ft

4

10.11 ft

9

Multiple Choice

You Do:

Find the circumference of the circle whose radius is 4 in

1

12.56 in

2

25.12 in

3

50.24 in

10

Match

Exit Ticket:

Match the following

Circumference

Circumference of a plate w/ d=6

Chord

Circumference

1/2 of the Diameter

C = $\pi d$

18.84

Line segment with both endpoints on the circle

Distance around the edge of a circle

Distance from the center to the edge of a circle divided by 2

What is something that always makes you laugh?

Type response here

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