Question

1. A cuboid has the dimensions 40 cm x 35 cm x
15 cm. Find (i) its surface area (ii) its volume.
a
on all sides.
per cm.
7 The volume of cuboi
O​

Answer 1

Appropriate Question :-

A cuboid has the dimensions 40 cm x 35 cm x 15 cm.

Find :-

(i) its surface area

(ii) its volume.

Answer :-

• Surface Area = 550 sq. cm.
• Volume = 21000 cubic cm.

Explanation :-

(i) Surface Area = 550 sq. cm.

We know that,

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

Put the values.

➞ 2(40 × 35 + 35 × 15 + 40 × 15).

➞ 2(1400 + 525 + 600).

➞ 2(2000 + 525).

➞ 2 × 2525.

➞ 550 sq. cm.

(ii) Volume = 21000 cubic cm.

We know that,

Volume of Cuboid = l × b × h.

➞ 40 × 35 × 15.

➞ 1400 × 15.

➞ 21000 cubic cm.

Answer 2

Answer:

Appropriate Question :-

A cuboid has the dimensions 40 cm x 35 cm x 15 cm.

Find :-

(i) its surface area

(ii) its volume.

Answer :-

Surface Area = 550 sq. cm.

Volume = 21000 cubic cm.

Explanation :-

(i) Surface Area = 550 sq. cm.

We know that,

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

Put the values.

➞ 2(40 × 35 + 35 × 15 + 40 × 15).

➞ 2(1400 + 525 + 600).

➞ 2(2000 + 525)

➞ 2 × 2525.

➞ 550 sq. cm.

(ii) Volume = 21000 cubic cm.

We know that,

Volume of Cuboid = l × b × h.

➞ 40 × 35 × 15.

➞ 1400 × 15.

➞ 21000 cubic cm.