48 area and circumference.notebook
Draw a circle.
Label the radius and diameter.
Trace the circumference.
do now
What do you know about pi?
1
48 area and circumference.notebook
Formulas:
Area:
Circumference:
A circle has a radius of 2.
a) Find the exact area and circumference.
b) Use 3.14 for pi to find an approximate circumference and area
2
48 area and circumference.notebook
A circle has a radius of 11.
a) Find the exact area and circumference.
b) Use 3.14 for pi to find an approximate circumference and area
A circle has a radius of 16.
try
a) Find the exact area and circumference.
b) Use 3.14 for pi to find an approximate circumference and area
3
48 area and circumference.notebook
A circle has a diameter of 3.
a) Find the exact area and circumference.
b) Use 22 for pi to find an approximate circumference and area
7
(leave your answer as a fraction)
A circle has a diameter of 8.
try
a) Find the exact area and circumference.
b) Use 22 for pi to find an approximate circumference and area
7
(leave your answer as a fraction)
4
48 area and circumference.notebook
Solving for r or d
A circle has an area of 9 . What is the radius?
A circle has an area of 25 . What is the radius? What is the
diameter?
5
48 area and circumference.notebook
Try
A circle has an area of 100 . What is the diameter?
A circle has a circumference of 12 . What is the diameter? What
is the radius?
6
48 area and circumference.notebook
A circle has a circumference of 49 . What is the diameter? What
is the radius?
Marker Boards
7
48 area and circumference.notebook
CW
A circle has a radius of 25. What is the area?
1
A circle has a radius of 120. What is the circumference?
2
8
48 area and circumference.notebook
Two step Area and Circumference problems
A circle has a circumference of 12 . What is the area?
3
A circle has a circumference of 6 . What is the area?
4
9
48 area and circumference.notebook
A circle has an area of 64 . What is the circumference?
5
6
10
48 area and circumference.notebook
p. 526 #17,18,23,24
p.540 #8,9,20,21
11