Example #1.
Find the surface area of a cube if the length of one side is equal to 5 cm.
The formula to use to find the surface area of cube is 6a^{2}
6a^{2} = 6 × a^{2} = 6 × 5^{2} = 6 × 25 = 150
The surface area of the cube is 150 cm^{2}
Example #2.
The dimensions of a rectangular prism are shown below
Length is equal 5 cm
Width is equal to 6 cm
Height is equal 3 cm
Find the surface area of the rectangular prism.
The formula to use to find the surface area of a rectangular prism as already shown above is 2 × l × w + 2 × l × h + 2 × w × h
2 × 5 × 6 + 2 × 5 × 3 + 2 × 6 × 3
2 × 30 + 2 × 15 + 2 × 18
60 + 30 + 36
90 + 36
126
The surface area of the rectangular prism is 126 cm^{2}
Sep 17, 20 03:57 PM
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