Download presentation

Presentation is loading. Please wait.

Published byMia McCormack Modified over 3 years ago

1
**SPI: 0606.4.4 Calculate with circumferences and areas of circles.**

6th Grade SPI: Calculate with circumferences and areas of circles.

2
**The circumference of a circle is**

The distance around a circle Hint: Circumference remember circle around

3
**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!

4
**The diameter is the distance across a circle through the center.**

5
**We use Pi as the measurement to help us find the circumference of a circle.**

Pi, not Pie!

6
HINT: Pi =3.14

7
**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.

8
**HINT: Always round your answers to the nearest tenth.**

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.

9
**Tell me what formula would be used to solve the next five problems.**

NOW…Let’s have some fun. Tell me what formula would be used to solve the next five problems.

10
3in C = 2 x 3.14 x r

11
8ft C = 3.14 d

12
122mm C = 2 x 3.14 x d

13
17.5 cm C = 3.14 x d

14
122.5mm C = 2 x 3.14 x r

15
**Now that we have determined the correct formula for each, let’s work the problems.**

16
The answer is: 18.8in 3in C = 2 x 3.14 x r

17
8ft C = 3.14 d The answer is: 25.1ft

18
122mm C = 2 x 3.14 x d The answer is: mm

19
17.5 cm C = 3.14 x d The answer is: 55cm

20
122.5mm C = 2 x 3.14 x r The answer is: 76,930mm

Similar presentations

OK

Circumference. Question 1 Which formula would be best to use to find the diameter of the following circle? C = 81 ft ?

Circumference. Question 1 Which formula would be best to use to find the diameter of the following circle? C = 81 ft ?

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on success and failures Ppt on marketing management introduction Ppt on two point perspective examples Ppt on limitation act 1953 Ppt on file system in unix/linux Ppt on road accident Ppt on conceptual artists Ppt on sources of data collection Download ppt on mind controlled robotic arms in medicine Free download ppt on diversity in living organisms class 9