Ticket in the Door (Rituals and Routines)

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Presentation transcript:

02.13.2018 Ticket in the Door (Rituals and Routines) Where should you place your book bag in Mrs. Janice Class? Have you placed your book bags where they should go? If not do so now! What is the call and response for Mrs. Janice’s Class? 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? Agenda Ticket in the Door (Rituals and Routines) Cornell Notes (Area of a Circle) Wrap-Up

What is the formula relating the circumference to the diameter? center Diameter Radius

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

Today we are going to find the area of circles

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

You can use the π button on your calculator 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 (π) , which is: 3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679 8214808651328230664709384460955058223172535940812848111745028410270193852110555964462294895493038196 4428810975665933446128475648233786783165271201909145648566923460348610454326648213393607260249141273 724587006606315588174881520920962829254091715364367892590360011330530548820466521384146951941511609... You can use the π button on your calculator

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

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

Example 2 Area= π x Radius2 Area= π x 52 = π x 25 = 78.5 5cm

Example 1 Area= π x Radius2 Radius= 18cm ÷ 2 = 9cm Area= π x 92 = 254.34 =254.3 18cm

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