Question

find the total surface area and lateral surface area of cuboid whose length breadth and hight is 20cm 15cm and 18cm.​

Answer 1

Given :

Length of the cuboid = 20cm

Breadth of the cuboid = 15 cm

Height of the cuboid = 18 cm

To find :

The total surface area and lateral surface area of cuboid.

Solve :

As we know the, the total surface area of cuboid (TSA)=

$\sf{ = 2(length \times breadth + breadth \times height + heigh \times length}$

Now, putting the values, we get,

$\sf{\implies \: TSA = 2(20 \times 15 + 15 \times 18 + 18 \times 20}$

TSA=2(300+270+360

$\sf{\implies TSA = 2 \times 930}$

$\sf{\implies TSA = 1860}$

Now,

The lateral surface area of the cuboid (LSA)=

$\sf{\implies 2 \times height( length+breadth)}$

Now, putting the values, we get,

$\sf{\implies LSA = \: 2 \times 18(20 + 15)}$

$\sf{\implies LSA = 2 \times 18 \times 35 }$

$\sf{\implies LSA = 1260}$

Hence, the total surface area and the lateral surface area of the cuboid are 1860cm² and 1260cm².

Answer 2

Answer:

Answer

:−

The dimensions of a cuboid are given as follows:

• Length of cuboid = 20 cm

• Breadth of cuboid = 15 cm

• Height of cuboid = 18 cm

✯ Find the Total Surface area and the Lateral Surface area.

Solution

:−

The total surface area is given as

• Total surface area of cuboid :-

:•⟹2(length×breadth+breadth×height+height× length)

:•⟹ 2( 20×15 + 15×18 + 18×20 )

:•⟹ 2( 300 + 270 + 360 )

:•⟹ 2×930

:•⟹ 1860 Ans.

Therefore, Total surface area of cuboid= 1860 cm

Also, the lateral surface area of cuboid :-

:•⟹ 2 × height(Length +Breadth)

:•⟹ 2 × 18 (20 + 15)

:•⟹ 1260 Ans.

Therefore, Lateral surface area of cuboid = 1260 cm²