Area of a Circle: Understanding Formulas and Calculations

Learn all about calculating the area of a circle, including the formulas for radius and diameter, the significance of Pi, and examples to help you grasp the concept clearly. From understanding the circumference to using the formula to find the area, this information-packed resource will guide you through the process step by step.

• Circle Area
• Pi Formula
• Diameter
• Radius
• Calculation

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1. Ticket in the Door Where should you place your book bag in Mrs. Janice Class? 02.13.2018 Have you placed your book bags where they should go? If not do so now! Agenda What is the call and response for Mrs. Janice s Class? Ticket in the Door (Rituals and Routines) Cornell Notes (Area of a Circle) Wrap-Up Is it appropriate to talk during instruction time in Mrs. Janice s Class? Is it ok to talk while my peers have the floor to talk? Can I eat sun flower seeds and chips in Mrs. Janice s Class? Should I be at or behind Mrs. Janice s desk? Respect, Respect, Respect your teacher and your peers)!!!!!! Format your papers for Cornell notes. Topic: Area of a Circle E.Q. How can I calculate the area of a circle?

2. circumference What is the formula relating the circumference to the diameter? center Diameter

3. circumference What is the formula relating the circumference to the Radius? center Diameter

4. Today we are going to find the area of circles

5. What you need to know DIAMETER RADIUS The area around the outside is the circumference

6. Pi Pi People noticed that if you divide the circumference of a circle by the diameter you ALWAYS get the same answer They called the answer Pi ( ) , which is: 3.1415926535897932384626433832795028841971693993751 058209749445923078164062862089986280348253421170679 821480865132823066470938446095505822317253594081284 8111745028410270193852110555964462294895493038196 442881097566593344612847564823378678316527120190914 5648566923460348610454326648213393607260249141273 724587006606315588174881520920962829254091715364367 892590360011330530548820466521384146951941511609... You can use the button on your calculator

7. You can find the area of a circle by using the formula- Area= x Radius2

8. Example 1 Area= x Radius2 Area= x 72 = x 49 = 153.93804 = 153.9cm2 (to 1dp) 7cm

9. Example 2 Area= x Radius2 Area= x 52 = x 25 = 78.5 5cm

10. Example 1 Area= x Radius2 Radius= 18cm 2 = 9cm Area= x 92 = x 81 = 254.34 =254.3 18cm

11. Reference https://www.tes.com/teaching-resource/ks3- area-of-a-circle-powerpoint-7571816