Telisa's Surface Area Growing Post

Surface Area...

Rectangular Prism...

A= L*W

Top & Base :

A= 13.5 * 5

A= 67.5 cm²

Front & Back :

A= 13.5 * 18.5

A= 249.75 cm²

Sides :

A= 18.5 * 5

A= 92.5 cm²

TSA = 249.75 + 249.75 + 92.5 + 92.5 + 67.5 + 67.5

TSA = 819.5 cm²

This is the net for my Rectangular prism ...

Triangular Prism ...

A = B* H ÷ 2

A = 1.4 * 2.3 ÷ 2

A = 3.22 ÷ 2

A = 1.61 m²

TSA = 1.61 + 1.61 + 1.61 +0.98 + 1.89

TSA = 7.7 m²

This is my net for a Triangular Prism...

Cylinder ...

r= d÷2

r= 7÷2

r=3.5cm

A = ╥r²

A = 3.14 * 3.5 * 3.5

A = 38.46 cm²

c = ╥d

c = 3.14 * 7

c = 21.98 cm²

A = L * W

A = 21.98 * 30

A = 659.4 cm²

TSA = 659.4 +38.46 + 38.46

TSA = 736.5 cm²

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