Question

1) If the length, breadth and height of a cuboid are 5 cm, 3 cm and 4 cm, then find its total surface area and curved surface area.​

Answer 1

$\huge\purple{Required \: Answer :}$

Given :

Length - 5cm

Breadth - 3cm

Height - 4cm

Solution :

Total Surface Area -

$= 2(lb + bh + lh) \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ = 2(5 \times 3 + 3 \times 4 + 5 \times 4) \\ = 2(15 + 12 + 20) \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ = 2(47) \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ = 94 \: {cm}^{3} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:$

Total Surface Area -$\huge{94 \: {cm}^{3}}$

Curved Surface Area -

$= 2(l + b) \times h \: \: \\ = 2(5 + 3) \times 4 \: \\ = 2(8) \times 4 \: \: \: \: \: \: \: \: \: \\ = 16 \times 4 \: \: \: \: \: \: \: \: \: \: \: \: \\ = 64 \: {cm}^{2} \: \: \: \: \: \: \: \: \: \: \:$

Curved Surface Area -$\huge{64 \: {cm}^{2}}$

$\huge{Thanks}$