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