Thursday, March 18, 2010

Surface Area Growing Post for Feburary 27th 2010

Surface Area Growing Post


Rectangular Prism




Formulas to calculate surface area of a rectangular prism


A of rect = (lxw) x 2


A of rect= (8x7) x2


A of rect= 112 mm2




A of rect= (lxw) x 2


A of rect= (7x4) x 2


A of rect= 56 mm2




A of rect= (lxw) x 2


A of rect= (8x4) x 2


A of rect= 64 mm2




TSA= 56+64+112


TSA= 232 mm2





Trianglular Prism




Formulas for finding the surface area of a triangular prism


A of tri= (bxh) / 2


A of tri= (4x2) / 2


A of tri= 4 mm2




A of rect= (lxw)


A of rect= (6x2)


A or rect= 12 mm2




A of rect= (lxw) x 2


A of rect= (6x 3.5) x 2


A of rect= 42 mm2





A of tri= (bxh) / 2


A of tri= (4x2) / 2


A of tri= 4 mm2




TSA= 4+42+12+4


TSA= 62 mm2




Formulas for fining the surface area of a cylinder.


R = d / 2


R= 2 / 2


R= 1 cm2








C= pi d


C= 3.14x2


C= 6.28 cm2






2x(pi x r x r ) + ( pi x b x h )


2x(3.14x 1 x 1) + ( 3.14 x 1 x 6.28 )






TSA= 3.14+19.7192


TSA= 22.8592 cm2







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