[tex] \huge{ \textbf{ \red{Answer}}}[/tex]

[tex] \textsf{(a) \: Total surface area of a circle=} {6a}^{2}[/tex]

[tex] \textsf{》TSA=}6× {7}^{2} [/tex]

[tex] \textsf{》TSA = }294 {cm}^{2} [/tex]

[tex] \textsf{Lateral surface area of cube = }{4a}^{2} [/tex]

[tex] \textsf{》LSA=}{4×7}^{2} [/tex]

[tex] \textsf{》LSA=196 }{cm}^{2} [/tex]

[tex] \textsf{(b) 8dm \: 5cm}[/tex]

[tex] \textsf{8dm \: 5cm=85cm} \\[/tex]

[tex] \textsf{Total \: surface \: area \: of \: a \: cube \: =}6 {a}^{2} [/tex]

[tex] \textsf{》TSA=}6× {85}^{2} [/tex]

[tex] \textsf{》TSA=} {43350 \: cm}^{2} [/tex]

[tex] \textsf{Lateral \: surface \: area \: of \: cube=}4 {a}^{2} [/tex]

[tex] \textsf{》LSA=}4× {85}^{2} [/tex]

[tex] \textsf{》LSA=}{28900 \: cm}^{2} [/tex]

Verified answer

Answer:

(a) 7 cm

Total surface area of a cube = 6a²

» TSA = 6 × 72

» TSA = 294 cm²

Lateral surface area of cube = 4a2

» LSA = 4 × 72

» LSA = 196 cm²

(b) 8 dm 5 cm

8 dm 5 cm = 85 cm

Total surface area of a cube = 6a²

» TSA = 6 x 852

» TSA = 43350 cm²

Lateral surface area of cube = 4a²

» LSA = 4 × 852

» LSA = 28900 cm²

Step-by-step explanation:

[tex]hope \: it \: helps \: u[/tex]