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Surface Area of a Cylinder. By Mr. Martin. Overview. 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 Measurements of the can. The Top. Formula for Area Circle? Area = Pi x r 2 Area= Pi x 3.75 2

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Presentation Transcript
overview
Overview
  • 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

Measurements of the can.

the top
The Top
  • Formula for Area Circle?
  • Area = Pi x r2
  • Area= Pi x 3.752
  • Area=3.14 (14.0625)
  • Area=44.15625 sq cm

Radius (r)

the bottom
The Bottom
  • Same as top
  • Area = Pi x r2
  • Area= Pi x 3.752
  • Area=3.14 (14.0625)
  • Area=44.15625 sq cm
the label

Height

The Label
  • What shape?
    • rectangle
  • Formula for area?
    • Height x width
  • Height?
    • 11cm

Width

  • Width?
    • Pi x Diameter
  • Area = 11(3.14)(7.5)=

259.05 sq cm

add top bottom and label
Add Top, Bottom and Label
  • 44.15625 + 44.15625 + 259.05 = 347.3625 square cm

Top

Bottom

now you try
Now you try:

Radius = 5 cm

Height = 12 cm

Note: These are not the

actual dimensions of the can.