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WARM UP

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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 ... – PowerPoint PPT presentation

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Title: WARM UP


1
WARM UP
  1. Find the circumference and area of a circle with
    diameter 7y.
  2. What is the area of an equilateral triangle with
    an apothem of 18?
  3. 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.

2
Section 11.6
  • Arc Lengths and Areas of Sectors

3
AREA of CIRCLE
  • Find the area of the whole circle.

4
Arc Length
  • Find the arc length.

How much of the circumference do I need?
ΒΌ
5
Find the Arc Length
60o
6
Area of a portion of a circle
  • Find the area of the shaded portion of the
    circle.

7
Area of a Sector
8
Try this one!
A
Hint Find the area of the whole sector and
subtract the area of the triangle.
60o
6
B
9
6
3
60o
6
10
  • 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.

11
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.
12
Practice Problems
  • Page 453
  • Classroom Exercises
  • 1 4, 6

13
Its Movie Time!
  • Circumference Video
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