Question

Find the total surface area (in cm2) of a cuboid of length, breadth and height of 10.5 cm, 8 cm and 9 cm respectively.

A) 607 B) 767 C) 769 D) 501

Answer 1

Given :

• Length of the cuboid = 10.5 cm
• Breadth of the cuboid = 8 cm
• Height of the cuboid = 9 cm

To find :

• Total surface area of cuboid =?

Step-by-step explanation :

It is Given that,

Length (l) of the cuboid = 10.5 cm

Breadth (b) of the cuboid = 8 cm

Height (h) of the cuboid = 9 cm

As We know that,

Total Surface Area of Cuboid = 2(lb + bh + hl)

Substituting the values in the above formula, we get,

= 2[(10.5 × 8) + (8 × 9) + (9 × 10.5)]

= 2[84 + 72 + 94.5]

= 2 × 250.5

= 501.

Therefore, Total Surface Area of Cuboid = 501 cm².

Hence, Option d). 501 is the correct option.

Answer 2

Question:

Find the total surface area (in cm²) of a cuboid of length, breadth and height of 10.5 cm, 8 cm and 9 cm respectively.

A) 607 B) 767 C) 769 D) 501

Answer:

Correct option D) 501 cm²

Given:

➛Length of cuboid : 10.5 cm.

➛Breadth of cuboid : 8 cm.

➛Height of cuboid : 9 cm.

To Find:

Total surface area of cuboid.

Solution:

We are given,

➛Length of cuboid ( l ) : 10.5 cm.

➛Breadth of cuboid ( b ) : 8 cm.

➛Height of cuboid ( h ) : 9 cm.

We know,

Total surface area of cuboid = 2( lb + bh + hl )

= 2 [ ( 10.5 × 8 ) + ( 8 × 9 ) + ( 9 × 10.5 )

= 2 ( 84 + 72 + 94.5 )

= 2 ( 250.5 )

= 501.

Total surface area of cuboid = 501 cm².

Therefore, option D) 501 is correct.