Question

find the total surface area of cubes having the following sides 1)3cm 2)5 cm 3)7.2 4)6.8 cm 5)5.5 cm 6)9.5 cm

Answer 1

1) l = 3cm then area = l³ = 3³ = 27cm²

2) l = 5cm then area = l³ = 5³ = 125cm²

3) l = 7.2 cm then area = l³ = 7.2³ = 373.24 cm²

4) l = 6.8cm then area = l³ = 6.8³ = 314.43 cm ²

5) l = 5.5 cm then area = l³ = 5.5³ = 166.37 cm²

6) l = 9.5 cm then area = l³ = 9.5³ = 857.37 cm²

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Answer 2

Hi!

1) side(a)=3cm
:. Total Surface area=
$= {6a}^{2} \\ = (6 \times {3}^{2})c {m}^{2} \\ = (6 \times 9 )c {m}^{2} \\ = 54c {m}^{2}$

2) side(a)=5cm
:. Total Surface area=
$= {6a}^{2} \\ = (6 \times {5}^{2})c {m}^{2} \\ = (6 \times 25)c {m}^{2} \\ = 150c {m}^{2}$

3)side(a)=7.2cm
:. Total Surface area=
$= {6a}^{2} \\ = (6 \times {(7.2)}^{2})c {m}^{2} \\ = (6 \times 5.84 )c {m}^{2} \\ = 311.04c {m}^{2}$


4)side(a)=6.8cm
:. Total Surface area=
$= {6a}^{2} \\ = (6 \times {(6.8)}^{2})c {m}^{2} \\ = (6 \times 46.24 )c {m}^{2} \\ = 277.44c {m}^{2}$

5)side(a)=5.5cm
:. Total Surface area=
$= {6a}^{2} \\ = (6 \times {(5.5)}^{2})c {m}^{2} \\ = (6 \times 30.25)c {m}^{2} \\ = 181.5c {m}^{2}$

6)side(a)=9.5cm
:. Total Surface area=
$= {6a}^{2} \\ = (6 \times {(9.5)}^{2})c {m}^{2} \\ = (6 \times 90.25 )c {m}^{2} \\ = 541.5c {m}^{2}$