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WARM UP

- Find the circumference and area of a circle with

diameter 7y. - What is the area of an equilateral triangle with

an apothem of 18? - A basketball rim has a diameter of 18 inches.

Find the circumference of the rim and the area it

encloses. Round the nearest whole number.

Section 11.6

- Arc Lengths and Areas of Sectors

AREA of CIRCLE

- Find the area of the whole circle.

Arc Length

- Find the arc length.

How much of the circumference do I need?

ΒΌ

Find the Arc Length

60o

Area of a portion of a circle

- Find the area of the shaded portion of the

circle.

Area of a Sector

Try this one!

A

Hint Find the area of the whole sector and

subtract the area of the triangle.

60o

6

B

6

3

60o

6

- A circle has area 160p cm2. If a sector of the

circle has area 32p cm2, - Find the measure of the arc of the sector.
- Find the length of the arc.

SAT Question

- 1) In the figure the radius of the circle O is

3. What is the perimeter of the shaded region?

HINT Find the length of the side of the

triangle in the region and the arc length of the

region.

Practice Problems

- Page 453
- Classroom Exercises
- 1 4, 6

Its Movie Time!

- Circumference Video