1. INSCRIBED SHAPES

2. The diameter of a DVD is 12.0 cm. The diameter of the hole
in the centre is 1.5 cm.  Find the area of the paper needed
for the DVD label.
Area CD = pi r2
Radius = diameter/2
Radius = 12/2
Radius = 6
12.0cm
1.5cm
Area CD =
pi r2
Area CD =
3.14 x 6 x 6
Area CD =
113.04cm2

3. The diameter of a DVD is 12.0 cm. The diameter of the hole
in the centre is 1.5 cm.  Find the area of the paper needed
for the DVD label.
Area hole = pi r2
Radius = diameter/2
Radius = 1.5/2
Radius = 0.75
12.0cm
1.5cm
Area hole =
pi r2
Area hole =
3.14 x 0.75 x 0.75
Area hole =
cm2

4. The diameter of a DVD is 12.0 cm. The diameter of the hole
in the centre is 1.5 cm.  Find the area of the paper needed
for the DVD label.
Area label = Area CD – Area hole
Area CD =
113.04cm2
Area hole =
cm2
12.0cm
1.5cm
Area label = –
Area label = cm2

5. If you are going to cut the label out of a square piece of
construction paper that measures 12cm by 12cm, how much
of the paper will you be throwing in the garbage?
12.0cm
Area wasted paper = Area paper – Area label
Area paper = side2
Area paper = 12 x 12
12.0cm
1.5cm
Area paper = 144cm2
Area label = cm2
Area wasted paper = 144 –
Area wasted paper = 32.73cm2