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Warm up: Solve for x 1.) 2.) 4.) 3.) 124◦ 70◦ x 18◦ x 260◦ x 20◦ 110◦

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Presentation on theme: "Warm up: Solve for x 1.) 2.) 4.) 3.) 124◦ 70◦ x 18◦ x 260◦ x 20◦ 110◦"— Presentation transcript:

1 Warm up: Solve for x 1.) 2.) 4.) 3.) 124◦ 70◦ x 18◦ x 260◦ x 20◦ 110◦

2 Questions over hw?

3 Daily Check

4 Circumference & Arc Length of Circles

5 The distance around a circle
Circumference The distance around a circle

6 Circumference or

7 Find the EXACT circumference.
r = 14 feet d = 15 miles

8 Ex 3 and 4: Find the circumference. Round to the nearest tenths.
33 yd 14.3 mm

9 5. A circular flower garden has a radius of 3 feet
5. A circular flower garden has a radius of 3 feet. Find the circumference of the garden to the nearest hundredths. C = ft

10 Arc Length The distance along the curved line making the arc (NOT a degree amount)

11 Arc Length

12 Ex 6. Find the Arc Length Round to the nearest hundredths
8m 70

13 Ex 7. Find the Arc Length Round to the nearest hundredths
110

14 Ex 8. Find the exact Arc Length.

15 Ex 9. What happens to the arc length if the radius were to be doubled
Ex 9. What happens to the arc length if the radius were to be doubled? Halved?

16 Practice from Notes Page
Classwork Practice from Notes Page

17 Area of Circles & Sectors

18 2 Types of Answers Exact Rounded Pi will be in your answer
Type the Pi button on your calculator Toggle your answer Do NOT write Pi in your answer Exact Pi will be in your answer

19 The amount of space occupied.
Area The amount of space occupied. r A= pr2

20 Find the EXACT area. r = 29 feet d = 44 miles

21 Find the area. Round to the nearest tenths.
53 cm 7.6 yd

22 Example 3 If S has a diameter of 10 inches, find the area of the circle to the nearest hundredths. A = in2

23 Sector the region bounded by two radii of the circle and their intercepted arc.

24 Area of a Sector

25 Find the area of the sector to the nearest hundredths.
Example 4 Find the area of the sector to the nearest hundredths. R 6 cm 60 Q A  cm2

26 Find the exact area of the sector.
Example 5 Find the exact area of the sector. 6 cm 120 7 cm Q R

27 Example 6 Find the area of a sector with a central angle of 45° if the diameter of the circle is 12 inches. Round to the nearest hundredths. A  in2

28 Example 7 A spinner is divided into 12 equal sections and the radius of the spinner is 4 inches. Every other section is shaded. Find the exact total area of the shaded region on the spinner. A = 8 in2

29 Homework 9 Problems

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