1.

Find the surface area of a cube whose edge is(i) 1.2 m(ii) 27 cm(iii) 3 cm(iv) 6 m(v) 2.1 m

Answer»

(i) We have,

Edge of cube = 1.2 m

Surface area of cube = 6 x side2 = 6 x 1.22 = 6 x 1.44 = 8.64 m2

(ii) We have,

Edge of cube = 27 cm

Surface area of cube = 6 x side2 = 6 x 272 = 6 x 729 = 4374 cm2

(iii) We have,

Edge of cube = 3 cm

Surface area of cube = 6 x side2 = 6 x 9 = 54 cm2

(iv) We have,

Edge of cube = 6 m

Surface area of cube = 6 x side2 = 6 x 62 = 216 m2

(v) We have,

Edge of cube = 2.1 m

Surface area of cube = 6 x side2 = 6 x 4.41 = 26.46 m2



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