Post on 19-Jan-2016
Bell Work
• The 3 in the diagram represents 30 ft in real life.
3 in
2 in 1.5 in
• What is the scale for this blueprint
• What is the ACTUAL area of the bedroom
Bedroom
Bathroom
Hint: What type of polygon is the
bathroom?
Area & Circumference
Objective:TLW
a) Apply the given formula to find the area of a circle, the circumference of a circle, or the
volume of a rectangular solid.
Radius & Diameter
Radius (r): the line HALFWAY through the circle
Diameter (d): the line splitting the circle in half
radiusdiameter
Diameter vs Radius
• True or false
• Question 1: The Diameter is half of the
radius? T or F
Question 2: If the diameter of a circle is
30 cm. The radius is 15 cm.
Radius & Diameter5 ft.
r =_____
d= ____
3.2 m
r =_____
d= ____
6 ¼ cm
r =_____
d= ____
2 ¼ inr =_____
d= ____
• AREA (A): the measurement INSIDE the circle. A = π r²
AREA radius
Ci
r
c
u
mfe
r
e
n
c
e
diameter
CIRCUMFERENCE (C) : the measurement AROUND the circle. C = 2πr
Area & Circumference
18 ft.r =____
d =_____
C= ____
A= ____
6.5 m
9 ¾ cm
r =____
d =_____
C= ____
A= ____
r =____
d =_____
C= ____
A= ____
4 ½ inr =____
d =_____
C= ____
A= ____
Area & Circumference
r =____
d = 5cm
C= ____
A= ____
r =____
d =_4.2ft__
C= ____
A= ____
r =_10m___
d =_____
C= ____
A= ____
r =_6.8in___
d =_____
C= ____
A= ____
Area & Circumference
AREA radius
Ci
r
c
u
mfe
r
e
n
c
e
diameter
a. Around a circle
b. Inside a circle
c. Line halfway through a circle
d. Line to the end of the circle