powerpoint - how to find the surface area of a cylinder
TRANSCRIPT
Surface Area of a Cylinder
By Mr. Martin
Overview
• Behold!Behold! A can with a:– Top (radius 3.75 cm)– Bottom (same as top),
and– Label (11 cm high)
Note: these are not the actual Note: these are not the actual Measurements of the can.Measurements of the can.
The Top
Radius (r)
• Formula for Area Circle?
• Area = Pi x r2
• Area= Pi x 3.752
• Area=3.14 (14.0625)• Area=44.15625 sq cm
The Bottom
• Same as top• Area = Pi x r2
• Area= Pi x 3.752
• Area=3.14 (14.0625)
• Area=44.15625 sq cm
• What shape?– rectangle
• Formula for area?– Height x width
• Height?– 11cm
The
Labe
l
• Width?– Pi x Diameter
• Area = 11(3.14)(7.5)= 259.05 sq cm
Width
Height
Add Top, Bottom and Label
• 44.15625 + 44.15625 + 259.05 = 347.3625 square cm
Top Bottom
Now you try:
Radius = 5 cm
Height = 12 cmHeight = 12 cm
Note: These are not the Note: These are not the actual dimensions of the can.actual dimensions of the can.