## Wednesday, March 3, 2010

### Nhea's Surface Area Growing Post

Rectangular Prism
• Draw a Rectangular Prism
• Draw its net.
• List all measurements on the drawing and on the net.

• Draw a Rectangular Prism
• Draw its net.
• List all measurements on the drawing and on the net.
• What formulas do you use to calculate surface area?
• - top = l x w- 13 x 2 = 26
• - side = l x w- 7 x 2 = 14
• - front = l x w- 13 x 7 = 91
• Calculate the surface are of your rectangular prism.
• - tsa =26+26+14+14+91+91=262 cm
Triangular Prism
• Draw a Triangular Prism
• Draw its net.
• List all measurements on the drawing and on the net.
• What formulas do you use to calculate surface area?
• -Triangles- bxh/2 = 7x8/2= 28 cm
• - lxw = 9x1.5 = 13.5 cm x2 =27 cm
• - lxw = 7x1.5 = 10.5 cm
• Calculate our the surface are of your triangular prism.
• - tsa = 27 + 10.5 + 28 + 28 = 93.5 cm
Cylinder
• Draw a Cylinder Prism
• Draw its net.
• List all measurements on the drawing and on the net.
• What formulas do you use to calculate surface area?
• - 5/2=2.5
• - 2 × (π × r2) + (π × d × h)
• - 2 × (π × 2.5x2.5) + (π × 5 × 28)
• Calculate our the surface are of your cylinder prism.
• - S.A. = 2 × (19.62) + (439.6) = 478.84 cm

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