Question

Q26. The total surface area of
cylinder with diameter of base
5cm and height 30 cm will be
O a)510.7 cm^2
O b)610 cm^2
O c) 505cm^2
O d)511cm^2​

Answer 1

Answer:

Hey friend,

Here is the answer you are searching for,

Diameter = 5 cm

=> Radius = 5/2 cm

Height = 30 cm

Therefore,

Surface area = 2πrh + 2πr²

= (2 × 22/7 × 5/2 × 30) + (2 × 22/7 × 5/2 × 5/2)

= (2 × 22/7 × 5 × 15) + (11/7 × 5 × 5)

= 3300/7 + 275/7

= 3575/7

= 510.7 cm².

Therefore,

Option ¤ (a) 510.7 cm² is the right answer.

HOPE IT HELPS YOU.

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Answer 2

Given :-

• A cylinder with diameter of base
• 5cm and height 30 cm

To find :-

• Total surface area of a cylinder

Solution :-

• Diameter of cylinder = 5cm

• Radius of cylinder = 5/2 = 2.5cm

• Height of cylinder = 30cm

As we know that

Total surface area of cylinder = 2πrh + 2πr²

Where " r " is radius and " h " height of a cylinder.

According to question

→ 2πrh + 2πr²

Take 2πr as a common

→ 2πr(h + r)

→ 2 × 22/7 + 2.5(30 + 2.5)

→ 44/7 × 2.5 × 32.5

→ 44/7 × 81.25

→ 3575/7

→ 510.7cm²

Hence,

• Total surface area of cylinder is 510.7cm²

Therefore,

• Correct option is (a)