Question

the circumference of the base of a cylinder is 220 cm and it's height is 105 cm find the letral surface area of the cylinder​

Answer 1

Answer:

4620cm

Step-by-step explanation:

Circumference = 220cm

2 π r = 220cm

2 x 22/7 x r = 220cm

r = 35cm

Lateral surface area( LSA ) = 2 π r h

                                            = 2 x 22/7 x 35 x 105

                                            = 44 x 105

                                           = 4620

Hope it satisfies your answer

Answer 2

Answer:

• Circumference of Base = 220 cm
• Height of cylinder = 105 cm
• Lateral Surface Area = ?

• According to the Question :

⇢ Lateral Surface Area = 2πrh

⇢ LSA = 2πr × h

⇢ LSA = Circumference × Height

⇢ LSA = 220 cm × 105 cm

⇢ LSA = 11 × 20 × 105 cm²

⇢ LSA = 11 × 2100 cm²

⇢ LSA = 23100 cm²

∴ Lateral surface area is 23100 cm².

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Tricks :

I split it to multiply the whole term with 11, as multiplying any number by 11 is very easy.

Let's say : Multiply (abc × 11)

Answer will be very simple in the form of ;

a (a + b) (b + c) c

Let's try a Question on it , Multiply (231 × 11)

2 (2 + 3) (3 + 1) 1 = 2541

Another Question : (478 × 11)

= 4 (4 + 7) (7 + 8) 8

= 4 (4 + 7) (15) 8

= 4 (4 + 7 + 1) 58

= 4 (12) 58

= (4 + 1) 258

= 5258

• In second question we should add the remaining number to next term along.