1. 11.4 Arc Lengths
HW pg. 749 #4­26 evens
March 31, 2015
Bellwork
Figure I ~ Figure II. Find the ratio of the perimeters and the
ratio of the areas. Then find the unknown area.
Ratio of perimeters: 4:3;
ratio of areas: 16:9;
Unknown Area :33.75 ft2
2. Rectangle I ~ Rectangle II.
In Rectangle I, the length is 20 feet & the perimeter is 64 feet.
In Rectangle II, the width is 8 yards.
Find the ratio of the area of Rectangle I to the area of Rectangle II.
144 : 576
1 : 4

2. 11.4 Arc Lengths
HW pg. 749 #4­26 evens
March 31, 2015
Circumference of a Circle:
C = 2πr (Twinkle­twinkle)
11.4 Circumference & Arc Length
The circumference of a circle is 28 π. What is the area of the circle?

3. 11.4 Arc Lengths
HW pg. 749 #4­26 evens
March 31, 2015
Arc Length: fraction of a circle's circumference
xo
360 *circumference where x = the arc measure
60
o
A
BC
4in
Length AB = ____
D
N
M
C
6.5 yd
280o
Length minor arc
MN = ____

4. 11.4 Arc Lengths
HW pg. 749 #4­26 evens
March 31, 2015
N
M
P
22
cm
Q
Arc QN = 60 o
Find the length of arc NM.
M
500
Q
diameter = 9 ft
Length of QM = _______
120oA
B
r
The length of AB is 6π. Find the radius.

5. 11.4 Arc Lengths
HW pg. 749 #4­26 evens
March 31, 2015

6. 11.4 Arc Lengths
HW pg. 749 #4­26 evens
March 31, 2015
11.4 HW pg. 749 #4­26 evens