Question

a toy is made with 7 equal cubes of side √7 cm. Six cubes are joined to six faces of a seventh cube find the total surface area of the toy​

Answer 1

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The total surface area of the toy is 210 sq.cm.

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Answer 2

Answer:

Total surface area of the toy = $210\text{ cm}^{2}$

Step-by-step explanation:

Given No of cube =7

Side of the cube = $s=\sqrt{7}\text{ cm}$

Six cubes are joined to six faces of a seventh cube find the total surface area of the toy​.

that means only five side of a cube is exposed and only surface area of six cube is effective.

Therefore,

The surface area of one side of a cube= $A=\text{side}^{2}=(\sqrt{7})^{2}=7\text{ cm}^{2}$

therefore, surface area of five side of a cube = $5\times7=35\text{ cm}^{2}$

therefore, surface area of six cube = $6\times35=210\text{ cm}^{2}$

Total surface area of the toy = $210\text{ cm}^{2}$