day 61 · day 61 1. opener a & b) give the translation. c) a certain regular polygon has...
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Day 61
1. Openera & b) Give the translation. c) A certain regular polygon has
apothem = 15 inches. Its perimeter = 80 inches. What is its area?
d) Each of its sides is 10 inches long. What kind of regular polygon is it?
e) What is the only food that doesn’t spoil?
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2. Famous Idiots in HistoryIn February, 2005, police officers discovered 3 million nickels buried in the backyard of a Florida home. They were part of a 45,000 pound shipment of nickels that was stolen the previous December.
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2. Famous Idiots in History
Clad Lincoln Jefferson FDR GW JFK AnthonySacagaw
ea
$ .01 .05 .10 .25 .50 1.00 1.00
grams 2.5 5 2.268 5.670 11.340 8.1 8.1
$/g .004 .01 .044 .044 .044 .123 .123
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3. Area of a CircleWhat is the area?
€
A = πr2
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3. Area of a CircleWhat is the area?
![Page 6: Day 61 · Day 61 1. Opener a & b) Give the translation. c) A certain regular polygon has apothem = 15 inches. Its perimeter = 80 inches. What is its area? d) Each of its sides is](https://reader033.vdocuments.us/reader033/viewer/2022042401/5f107d197e708231d4495bb8/html5/thumbnails/6.jpg)
3. Area of a CircleWhat is the area?
![Page 7: Day 61 · Day 61 1. Opener a & b) Give the translation. c) A certain regular polygon has apothem = 15 inches. Its perimeter = 80 inches. What is its area? d) Each of its sides is](https://reader033.vdocuments.us/reader033/viewer/2022042401/5f107d197e708231d4495bb8/html5/thumbnails/7.jpg)
3. Area of a CircleWhat is the area?
r
half the circumference
![Page 8: Day 61 · Day 61 1. Opener a & b) Give the translation. c) A certain regular polygon has apothem = 15 inches. Its perimeter = 80 inches. What is its area? d) Each of its sides is](https://reader033.vdocuments.us/reader033/viewer/2022042401/5f107d197e708231d4495bb8/html5/thumbnails/8.jpg)
3. Area of a CircleWhat is the area?
r
πr
![Page 9: Day 61 · Day 61 1. Opener a & b) Give the translation. c) A certain regular polygon has apothem = 15 inches. Its perimeter = 80 inches. What is its area? d) Each of its sides is](https://reader033.vdocuments.us/reader033/viewer/2022042401/5f107d197e708231d4495bb8/html5/thumbnails/9.jpg)
3. Area of a CircleWhat is the area?
€
A = πr2
![Page 10: Day 61 · Day 61 1. Opener a & b) Give the translation. c) A certain regular polygon has apothem = 15 inches. Its perimeter = 80 inches. What is its area? d) Each of its sides is](https://reader033.vdocuments.us/reader033/viewer/2022042401/5f107d197e708231d4495bb8/html5/thumbnails/10.jpg)
3. Area of a CircleWhat is the area?
€
A = πr2
9 in.
€
A = π 9( )2
€
A = 81π sq. inches
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3. Area of a CircleWhat is the radius?
A = 33 sq. inches
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4. Classworkpg. 435 // #1 - 8, 12 - 15
Or: give a formula for area (A) in terms of circumference (C)
5. Break
6. Show and Tell
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7. Sectors, Segments, and AnnulusesWhat is the area?
Annuli
Sector Segment Annulus
r
a°a°
rr R
a fraction of the circle the sector minus a triangle a big circle minus a small one
€
A =a360
πr2
€
A =a360
πr2 − 12bh
€
A = πR2 −πr2
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8. Classworkpg. 439 // #1 - 14
9. HomeworkBring compass.
Find the area of a stop sign in square inches.